Use the identity (x+a) (x+b)=x²+(a+b)x+ab to find the following products: (i) (x+3)(x+7) (ii) (4x+5)(4x+1)

(i) (x+3)(x+7) = (x)²+(3+7)x+3×7
[Using identity(x+a)(x+b)=x²+(a+b)x+ab
x²+10x+21
(ii) (4x+5)(4x+1)=(4x)²+(5×1)4x+5×1
[Using identity(x+a)(x+b)=x²+(a+b)x+ab
= 16x²+6x4x+5=16x²+24x+5

Class 8 Maths Chapter 9 Exercise 9.5 Solution in Video

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