Question

How do you solve `2x^2+11=131` by square roots?

Answer 1

Take the `11` to the other side first:

Explanation:

`->2x^2=131-11=120`

`->x^2=120/2=60`

`->x_(1,2)=+-sqrt60=+-2sqrt15`

Note!
There are two solutions, as `-sqrt60` will also be `60` when squared. This is often forgotten.