Given: 2x² + x – a = 5 ⇒ 2(0)² + 0-a = 5 [Putting x = 0 ] ⇒ 0 + 0 - a = 5 ⇒ a = -5 Hence, the value of a is -5. Class 7 Maths Chapter 12 Exercise 12.3 for more answers vist to: https://www.tiwariacademy.com/ncert-solutions/class-7/maths/chapter-12/
Given: 2x² + x – a = 5
⇒ 2(0)² + 0-a = 5 [Putting x = 0 ]
⇒ 0 + 0 – a = 5
⇒ a = -5
Hence, the value of a is -5.
Simplify the expression and find its value when a= 5 and b =-3: 2(a²+ab)+3-ab
Given: 2(a²+ab)+3-ab ⇒ 2a²+2ab+3-ab ⇒ 2a²+2ab-ab+3 ⇒ 2a²+ab+3 ⇒ 2(5)² + (5)(-3)+3 [Putting a = 5 , b = -3 ] ⇒ 2 x 25 - 15 +3 ⇒ 50 - 15 + 3 ⇒ 38 Class 7 Maths Chapter 12 Exercise 12.3 for more answers vist to: https://www.tiwariacademy.com/ncert-solutions/class-7/maths/chapter-12/
Given: 2(a²+ab)+3-ab
⇒ 2a²+2ab+3-ab
⇒ 2a²+2ab-ab+3
⇒ 2a²+ab+3
⇒ 2(5)² + (5)(-3)+3 [Putting a = 5 , b = -3 ]
⇒ 2 x 25 – 15 +3
⇒ 50 – 15 + 3
⇒ 38
Class 7 Maths Chapter 12 Exercise 12.3
for more answers vist to:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-7/maths/chapter-12/
What should be the value of a if the value of 2x² + x – a equals to 5, when x = 0 ?
Given: 2x² + x – a = 5 ⇒ 2(0)² + 0-a = 5 [Putting x = 0 ] ⇒ 0 + 0 - a = 5 ⇒ a = -5 Hence, the value of a is -5. Class 7 Maths Chapter 12 Exercise 12.3 for more answers vist to: https://www.tiwariacademy.com/ncert-solutions/class-7/maths/chapter-12/
Given: 2x² + x – a = 5
⇒ 2(0)² + 0-a = 5 [Putting x = 0 ]
⇒ 0 + 0 – a = 5
⇒ a = -5
Hence, the value of a is -5.
Class 7 Maths Chapter 12 Exercise 12.3
for more answers vist to:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-7/maths/chapter-12/
Simplify these expressions and find their values if x=3,a=-1,b=-2: 3x-5-x+9
3x-5-x+9 = 3x - x - 5 + 9 = 2x + 4 = 2 x 3 + 4 [Putting x = 3] = 6 + 4 = 10 Class 7 Maths Chapter 12 Exercise 12.3 for more answers vist to: https://www.tiwariacademy.com/ncert-solutions/class-7/maths/chapter-12/
3x-5-x+9 = 3x – x – 5 + 9 = 2x + 4
= 2 x 3 + 4 [Putting x = 3]
= 6 + 4 = 10
Class 7 Maths Chapter 12 Exercise 12.3
for more answers vist to:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-7/maths/chapter-12/
Simplify the expressions and find the value if x is equal to 2: x+7+4(x-5)
x+7+4(x-5) = x+7+4x-20 = x + 4x + 7 - 20 = 5x - 13 = 5 x 2 - 13 [Putting x = 2 ] = 10 - 13 = -3 Class 7 Maths Chapter 12 Exercise 12.3 for more answers vist to: https://www.tiwariacademy.com/ncert-solutions/class-7/maths/chapter-12/
x+7+4(x-5) = x+7+4x-20 = x + 4x + 7 – 20
= 5x – 13 = 5 x 2 – 13 [Putting x = 2 ]
= 10 – 13 = -3
Class 7 Maths Chapter 12 Exercise 12.3
for more answers vist to:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-7/maths/chapter-12/
When a = 0,b=-1, find the value of the given expressions: 2a+2b
(i) 2a + 2b = 2(0)+2(-1) [Putting a = 0,b = -1] = 0 – 2 = -2 Class 7 Maths Chapter 12 Exercise 12.3 for more answers vist to: https://www.tiwariacademy.com/ncert-solutions/class-7/maths/chapter-12/
(i) 2a + 2b = 2(0)+2(-1) [Putting a = 0,b = -1]
= 0 – 2 = -2
Class 7 Maths Chapter 12 Exercise 12.3
for more answers vist to:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-7/maths/chapter-12/