Question

How do you solve `(x - 1) ^ { 2} = 9`?

Answer 1

`x=-2`,`x=4`

Explanation:

Equation can be rewritten as:
`x^2-2x+1-9=0`
`x^2-2x-8=0`
`x^2-4x+2x-8=0`
`x(x-4)+2(x-4)=0`
`(x-4)(x+2)=0`
hence
`x=-2` and `x=4`