Use identity (x+a) (x +b) = x2 + (a+b) x +ab
(4x + 5 ) (4x -1)

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Solution

(4x + 5 ) (4x -1)

=(4x)^2 + (5-1)4x+ 5-1

= 16x^2 +16x -5

which the answer
or shortly 16(x^2+x) -5

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