Question

(4x+5) (4x-1) F find the following squares by using the identities identities

Answer 1

Answer:

on comparing it with formula (x+a) (x+b) = x²+(a+b) x +ab

we find that x= 4x , a=5 and b=-1

now putting these values in this equation we get

(4x) ² + [5+(-1) ] x + 5×(-1)

now we get

16x² + (4) x + (-5)

we now get 16x² + 4x -5 as answer