Question

How do you solve `9n^2+10=91`?

Answer 1

`n=+-3`

Explanation:

`9n^2+10=91`

`rarr 9n^2=81` (after subtracting `10` from each side)

`rarr n^2 =9` (after dividing both sides by `9`)

`rarr n=+-3` (the two possible values which squared are equal to `9`)