x² - 2x - 8 = x² - 4x + 2x - 8 = x(x - 4) + 2(x - 4) = (x + 2)(x - 4) The value of x² - 2x - 8 is zero if x + 2 = 0 or x - 4 = 0 x = -2 or x = 4 Therefore, the zeroes of x² - 2x - 8 are -2 and 4. Now Sum of zeroes = -2 + 4 = 2 = -(-2)/1 =-(Cofficient of x)/(Cofficient of x²) Product of zeroes = (-2)Read more
x² – 2x – 8
= x² – 4x + 2x – 8
= x(x – 4) + 2(x – 4)
= (x + 2)(x – 4)
The value of x² – 2x – 8 is zero if x + 2 = 0 or x – 4 = 0
x = -2 or x = 4
Therefore, the zeroes of x² – 2x – 8 are -2 and 4. Now
Sum of zeroes = -2 + 4 = 2 = -(-2)/1 =-(Cofficient of x)/(Cofficient of x²)
Product of zeroes = (-2) x 4 = -8 =-8/1 = (Cofficient term)/Cofficient of x²)
4s² - 4s +1 = 4s² - 2s - 2s + 1 = 2s(2s - 1) - 1(2s - 1) = (2s - 1)(2s - 1) The value of 4s² - 4s + 1 is zero if 2s - 1 = 0 ⇒ s = 1/2 Therefore, the zeroes of 4s² - 4s + 1 are 1/2 and 1/2. Now, Sum of zeroes = 1/2 + 1/2 = 1 = -(4)/4 = -(Cofficient of s)/(Cofficient of s²) Product of zeroes = 1/2 x 1Read more
4s² – 4s +1
= 4s² – 2s – 2s + 1
= 2s(2s – 1) – 1(2s – 1)
= (2s – 1)(2s – 1)
The value of 4s² – 4s + 1 is zero if 2s – 1 = 0 ⇒ s = 1/2
Therefore, the zeroes of 4s² – 4s + 1 are 1/2 and 1/2.
Now, Sum of zeroes = 1/2 + 1/2 = 1 = -(4)/4 = -(Cofficient of s)/(Cofficient of s²)
Product of zeroes = 1/2 x 1/2 = 1/4 = 1/4 = (Constant term)/Coefficient of s²
29/343 343 = 7x7x7 = 7³ Since the denominator is not in the form 2^m x 5^n, and it has 7 as its factor, the decimal expansion of 29/343 is non-terminating repeating. See this 👇
29/343
343 = 7x7x7 = 7³
Since the denominator is not in the form 2^m x 5^n, and it has 7 as its factor, the decimal expansion of 29/343 is non-terminating repeating.
129/2²5⁷7⁵ Since the denominator is not of the form 2^m x 5^n, and it also has 7 as its factor, the decimal expansion of 129/2²5⁷7⁵ non-terminating repeating. Explanation Video 😊👇
129/2²5⁷7⁵
Since the denominator is not of the form 2^m x 5^n, and it also has 7 as its factor, the decimal expansion of 129/2²5⁷7⁵ non-terminating repeating.
Let 6 + √2 be rational. Therefore, we can find two co-prime integers a, b (b 0) such that 6 + √2 = a/b ⇒ √2 = a/b - 6 Since a and b are integers,a/b - 6 is also rational and hence, √2 should be rational. This contradicts the fact that √2 is irrational. Therefore, our assumption is false and hence, 6Read more
Let 6 + √2 be rational.
Therefore, we can find two co-prime integers a, b (b 0) such that
6 + √2 = a/b
⇒ √2 = a/b – 6
Since a and b are integers,a/b – 6 is also rational and hence, √2 should be rational. This
contradicts the fact that √2 is irrational. Therefore, our assumption is false and hence,
6 + √2 is irrational.
It's a little tricky one🤔, Let √5 is a rational number. Therefore, we can find two integers a, b (b ≠ 0) such that √5 = a/b Let a and b have a common factor other than 1. Then we can divide them by the common factor, and assume that a and b are co-prime. a = √5b ⇒ a² = 5b² Therefore, a² is divisibleRead more
It’s a little tricky one🤔,
Let √5 is a rational number.
Therefore, we can find two integers a, b (b ≠ 0) such that √5 = a/b Let a and b have a common factor other than 1. Then we can divide them by the common factor, and assume that a and b are co-prime.
a = √5b
⇒ a² = 5b²
Therefore, a² is divisible by 5 and it can be said that a is divisible by 5.
Let a = 5k, where k is an integer
(5k)² = 5b²
⇒ 5k² = b²
This means that b² is divisible by 5 and hence, b is divisible by 5.
This implies that a and b have 5 as a common factor.
And this is a contradiction to the fact that a and b are co-prime.
Hence, √5 cannot be expressed as p/q or it can be said that √5 is irrational.
Let 3+2√5 is rational. Therefore, we can find two co-prime integers a, b (b ≠ 0) such that 3+2√5 = a/b 2√5 = (a/b)-3 √5 = 1/2((a/b) - 3) Since a andbare integers, 1/2((a/b) - 3) will also be rational and therefore, √5 is rational. This contradicts the fact that √5 is irrational. Hence, our assumptioRead more
Let 3+2√5 is rational.
Therefore, we can find two co-prime integers a, b (b ≠ 0) such that
3+2√5 = a/b
2√5 = (a/b)-3
√5 = 1/2((a/b) – 3)
Since a andbare integers, 1/2((a/b) – 3) will also be rational and therefore, √5 is rational.
This contradicts the fact that √5 is irrational. Hence, our assumption that 3 + 2√5 is rational is false. Therefore, 3 +2√5 is irrational.
Let 1/√2 is rational. Therefore, we can find two co-prime integers a, b (b ≠ 0) such that 1/√2 = a/b Or √2 = b/a b/a is as a and b are integers. Therefore, √2 is rational which contradicts to the fact that √2 is irrational. Hence, our assumption is false and 1/√2 is irrational. Video Explanation😀
Let 1/√2 is rational.
Therefore, we can find two co-prime integers a, b (b ≠ 0) such that
1/√2 = a/b
Or
√2 = b/a
b/a is as a and b are integers.
Therefore, √2 is rational which contradicts to the fact that √2 is irrational.
Hence, our assumption is false and 1/√2 is irrational.
Let 7√5 is rational. Therefore, we can find two co-prime integers a, b (b ≠ 0) such that 7√5 = a/b ⇒ √5 = a/7b a/7b is rational as a and b are integers. Therefore, √5 should be rational. This contradicts the fact that √5 is irrational. Therefore, our assumption that 7√5 is rational is false. Hence,Read more
Let 7√5 is rational.
Therefore, we can find two co-prime integers a, b (b ≠ 0) such that
7√5 = a/b
⇒ √5 = a/7b
a/7b is rational as a and b are integers.
Therefore, √5 should be rational.
This contradicts the fact that √5 is irrational. Therefore, our assumption that 7√5 is rational is false. Hence, 7√5 is irrational.
Find the zeroes of the following quadratic polynomials and verify the relationship between the zeroes and the coefficients. x² – 2x – 8.
x² - 2x - 8 = x² - 4x + 2x - 8 = x(x - 4) + 2(x - 4) = (x + 2)(x - 4) The value of x² - 2x - 8 is zero if x + 2 = 0 or x - 4 = 0 x = -2 or x = 4 Therefore, the zeroes of x² - 2x - 8 are -2 and 4. Now Sum of zeroes = -2 + 4 = 2 = -(-2)/1 =-(Cofficient of x)/(Cofficient of x²) Product of zeroes = (-2)Read more
x² – 2x – 8
= x² – 4x + 2x – 8
= x(x – 4) + 2(x – 4)
= (x + 2)(x – 4)
The value of x² – 2x – 8 is zero if x + 2 = 0 or x – 4 = 0
x = -2 or x = 4
Therefore, the zeroes of x² – 2x – 8 are -2 and 4. Now
Sum of zeroes = -2 + 4 = 2 = -(-2)/1 =-(Cofficient of x)/(Cofficient of x²)
Product of zeroes = (-2) x 4 = -8 =-8/1 = (Cofficient term)/Cofficient of x²)
Video Explanation 👇
See lessFind the zeroes of the following quadratic polynomials and verify the relationship between the zeroes and the coefficients. 4s² – 4s + 1.
4s² - 4s +1 = 4s² - 2s - 2s + 1 = 2s(2s - 1) - 1(2s - 1) = (2s - 1)(2s - 1) The value of 4s² - 4s + 1 is zero if 2s - 1 = 0 ⇒ s = 1/2 Therefore, the zeroes of 4s² - 4s + 1 are 1/2 and 1/2. Now, Sum of zeroes = 1/2 + 1/2 = 1 = -(4)/4 = -(Cofficient of s)/(Cofficient of s²) Product of zeroes = 1/2 x 1Read more
4s² – 4s +1
= 4s² – 2s – 2s + 1
= 2s(2s – 1) – 1(2s – 1)
= (2s – 1)(2s – 1)
The value of 4s² – 4s + 1 is zero if 2s – 1 = 0 ⇒ s = 1/2
Therefore, the zeroes of 4s² – 4s + 1 are 1/2 and 1/2.
Now, Sum of zeroes = 1/2 + 1/2 = 1 = -(4)/4 = -(Cofficient of s)/(Cofficient of s²)
Product of zeroes = 1/2 x 1/2 = 1/4 = 1/4 = (Constant term)/Coefficient of s²
Explanation 🤠
See lessWithout actually performing the long division, state whether the following rational numbers will have a terminating decimal expansion or a non-terminating repeating decimal expansion: 29 / 343
29/343 343 = 7x7x7 = 7³ Since the denominator is not in the form 2^m x 5^n, and it has 7 as its factor, the decimal expansion of 29/343 is non-terminating repeating. See this 👇
29/343
343 = 7x7x7 = 7³
Since the denominator is not in the form 2^m x 5^n, and it has 7 as its factor, the decimal expansion of 29/343 is non-terminating repeating.
See this 👇
See lessWithout actually performing the long division, state whether the following rational numbers will have a terminating decimal expansion or a non-terminating repeating decimal expansion: 23 / 2³5²
23/2³5² Denominator = 2³5² The denominator is of the form 2^m x 5^n. Hence, the decimal expansion of 23/2³5² is terminating. Explanation 👌
23/2³5²
Denominator = 2³5²
The denominator is of the form 2^m x 5^n.
Hence, the decimal expansion of 23/2³5² is terminating.
Explanation 👌
See lessWithout actually performing the long division, state whether the following rational numbers will have a terminating decimal expansion or a non-terminating repeating decimal expansion: 129 / 2² 5⁷ 7⁵
129/2²5⁷7⁵ Since the denominator is not of the form 2^m x 5^n, and it also has 7 as its factor, the decimal expansion of 129/2²5⁷7⁵ non-terminating repeating. Explanation Video 😊👇
129/2²5⁷7⁵
Since the denominator is not of the form 2^m x 5^n, and it also has 7 as its factor, the decimal expansion of 129/2²5⁷7⁵ non-terminating repeating.
Explanation Video 😊👇
See lessProve that the following is irrational: 6+√2
Let 6 + √2 be rational. Therefore, we can find two co-prime integers a, b (b 0) such that 6 + √2 = a/b ⇒ √2 = a/b - 6 Since a and b are integers,a/b - 6 is also rational and hence, √2 should be rational. This contradicts the fact that √2 is irrational. Therefore, our assumption is false and hence, 6Read more
Let 6 + √2 be rational.
Therefore, we can find two co-prime integers a, b (b 0) such that
6 + √2 = a/b
⇒ √2 = a/b – 6
Since a and b are integers,a/b – 6 is also rational and hence, √2 should be rational. This
contradicts the fact that √2 is irrational. Therefore, our assumption is false and hence,
6 + √2 is irrational.
See here👇
See lessProve that √5 is irrational.
It's a little tricky one🤔, Let √5 is a rational number. Therefore, we can find two integers a, b (b ≠ 0) such that √5 = a/b Let a and b have a common factor other than 1. Then we can divide them by the common factor, and assume that a and b are co-prime. a = √5b ⇒ a² = 5b² Therefore, a² is divisibleRead more
It’s a little tricky one🤔,
Let √5 is a rational number.
Therefore, we can find two integers a, b (b ≠ 0) such that √5 = a/b Let a and b have a common factor other than 1. Then we can divide them by the common factor, and assume that a and b are co-prime.
a = √5b
⇒ a² = 5b²
Therefore, a² is divisible by 5 and it can be said that a is divisible by 5.
Let a = 5k, where k is an integer
(5k)² = 5b²
⇒ 5k² = b²
This means that b² is divisible by 5 and hence, b is divisible by 5.
This implies that a and b have 5 as a common factor.
And this is a contradiction to the fact that a and b are co-prime.
Hence, √5 cannot be expressed as p/q or it can be said that √5 is irrational.
See this 👇
See lessProve that 3 + 2√5 is irrational.
Let 3+2√5 is rational. Therefore, we can find two co-prime integers a, b (b ≠ 0) such that 3+2√5 = a/b 2√5 = (a/b)-3 √5 = 1/2((a/b) - 3) Since a andbare integers, 1/2((a/b) - 3) will also be rational and therefore, √5 is rational. This contradicts the fact that √5 is irrational. Hence, our assumptioRead more
Let 3+2√5 is rational.
Therefore, we can find two co-prime integers a, b (b ≠ 0) such that
3+2√5 = a/b
2√5 = (a/b)-3
√5 = 1/2((a/b) – 3)
Since a andbare integers, 1/2((a/b) – 3) will also be rational and therefore, √5 is rational.
This contradicts the fact that √5 is irrational. Hence, our assumption that 3 + 2√5 is rational is false. Therefore, 3 +2√5 is irrational.
See here 😇
See lessProve that the following is irrational: 1/√2
Let 1/√2 is rational. Therefore, we can find two co-prime integers a, b (b ≠ 0) such that 1/√2 = a/b Or √2 = b/a b/a is as a and b are integers. Therefore, √2 is rational which contradicts to the fact that √2 is irrational. Hence, our assumption is false and 1/√2 is irrational. Video Explanation😀
Let 1/√2 is rational.
Therefore, we can find two co-prime integers a, b (b ≠ 0) such that
1/√2 = a/b
Or
√2 = b/a
b/a is as a and b are integers.
Therefore, √2 is rational which contradicts to the fact that √2 is irrational.
Hence, our assumption is false and 1/√2 is irrational.
Video Explanation😀
See lessProve that the following are irrational: 7√5
Let 7√5 is rational. Therefore, we can find two co-prime integers a, b (b ≠ 0) such that 7√5 = a/b ⇒ √5 = a/7b a/7b is rational as a and b are integers. Therefore, √5 should be rational. This contradicts the fact that √5 is irrational. Therefore, our assumption that 7√5 is rational is false. Hence,Read more
Let 7√5 is rational.
Therefore, we can find two co-prime integers a, b (b ≠ 0) such that
7√5 = a/b
⇒ √5 = a/7b
a/7b is rational as a and b are integers.
Therefore, √5 should be rational.
This contradicts the fact that √5 is irrational. Therefore, our assumption that 7√5 is rational is false. Hence, 7√5 is irrational.
See this 👇
See less