Question

(5x-6)^2=25x^2-60x+36. Where did the -60x come from?

Answer 1

see below

Explanation:

(5x-6)^2

This means

(5x-6)*(5x-6)

FOIL

First: 5x*5x = 25x^2

outer: 5x*-6 = -30x

inner -6*5x = -30

last -6*-6 = 36

Add these together

25x^2 -30x-30x +36

Combine like terms

25x%2 -60x+36