Question

Expand the expression ( 2 + 5(a+b))^2

Answer 1

( 2 + 5(a+b))^2 is the same as ( 2 + 5(a+b))( 2 + 5(a+b))

I'm going to let z = 5(a+b) to simplify things for a bit

Answer 2

so we really have (2+z)(2+z)

Answer 3

actually I'm going to use y instead of z since my 2's and z's look a bit alike