Question

Question #12739

Answer 1

`x=3 or x=-3`

Explanation:

`x^2 = 9`
Take square root
`x= +-sqrt9`
`x=3 or x=-3`

Answer 2

`x=3`

Explanation:

`x^2=9`
`x.x=3*3`
`sqrt(x^2)=x`
Likewise, `sqrt(3^2)=3`
`:.x=3`