# How do you solve #x^2 - 3x - 28 = 0# by completing the square?

##### 1 Answer

Jun 19, 2016

x is either 7 or

#### Explanation:

We have,

This can be written as

Now adding the square of 3/2 on both sides.

Carefully notice that the LHS becomes a square

[A side note: if

So,

So x is either 7 or