Question

How do you solve `x^2-56=(-x)` by factoring?

Answer 1

`x=-8`
or
`x=7`

Explanation:

`x^2-56 = (-x)`

`rArr x^2+x-56 = 0`

Factoring:
`rArr (x+8)(x-7) = 0`

Either
`color(white)("XXX")(x+8) = 0 rArr x=-8`
or
`color(white)("XXX")(x-7)=0 rArr x=7`