# How do you solve #n^2-4=77#?

##### 1 Answer

Aug 4, 2016

#### Answer:

#### Explanation:

On the left side of the equation you're left with

Take the square root (since that is the inverse of squaring a number) on both sides of the equation to get n by itself:

Thus,

The plus or minus symbol means that the answer can be positive 9 or negative 9.