Question

Which is a solution to (x − 2)(x + 10) = 13?

Answer 1

You'll need to expand (x − 2)(x + 10) first,

(x − 2)(x + 10) = 13

`x^2+8 x-20=13`

`x^2+8 x+16=49`

`(x+4)^2=49`

`x+4= \pm 7`

`x=3 , x=-11`