Using the identity- (X+a) (X+b) = x² + (a+b)X + ab
Find (4x-5) (4x-1)
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=. (4x)^2+[(-5)+(-1)]4x+(-5)×(-1)
=. 8x+(-6)4x+5
=. 8x-24x+5
=. -16x+5
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