Question

Solve using identities (5x-5) (5x+1/2)

Answer 1

(5x-5)(5x+1/2)
Using identity
(x+a) (x+b) =x^2+(a+b)x+ab
Her x=5x, a=-5,b=1/2

=(5x)^2+(-5+1/2)5x+(-5*1/2)
25x^2+-45x/2+-5/2
50x^2-45x-5/2