Question

Use the identity (X+a) (X+b) = X^2+(a+b)X+ab to find the product of (4X+5)(4X-1).

Answer 1

= (4x + 5) (4x - 1)
= [4x + 5] [(4x + (-1)]
Using Identity
= $(4x)^{2} + [5 +(-1)]4x + 5(-1)$
= 16$x^{2}$ + [5-1]4x - 5
= 16$x^{2}$ + 4(4x) - 5
= 16$x^{2}$ + 16x - 5


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Answer 2

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