Question

How do you solve `(2k-1)^2=9`?

Answer 1

`k= 2` or `k = -1`

Explanation:

you can take the square root from both sides but you must remember that there will be two possible options. Either the value will be positive or negative so
`2k-1 = 3` or `1-2k = 3`
`2k= 4` or `-2k = 2`
`k= 2` or `k = -1`

then we plug both in and see if they work
and they both indeed do.