Question

How do you solve `(x + 8)^2 = 81`?

Answer 1

`x=1 or x=-17`

Explanation:

`(x+8)^2= 81 = (+-9)^2`

`rArr (x+8) = +-9`

If `(x+8)=+9` then
`color(white)("XXX")x=+9-8=7`

If `(x+8)=-9` then
`color(white)("XXX")x=-9-8=-17`