Q : 1       Use the identity  (x+a)(x+b)=x^2+(a+b)x+ab  to find the following products.

               (iv) (4x+5)(4x-1)

Answers (1)

We use identity  (x+a)(x+b)=x^2+(a+b)x+ab
In this a = 5 , b = -1 and x = 4x 
                                             (4x+5)(4x-1) =  (4x)^2+(5+(-1))4x+(5)(-1)
                                                                                  = 16x^2+16x- 5
                                             

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