Question

Solve for x: 2x^2 - 18 = 0

please give detailed steps!!

Answer 1

`x = 3`

or

`x = - 3`

Explanation:

Set up equation

`2 {x}^(2) - 18 = 0`

Add 18 on both sides

`2 {x}^(2) = 18`

Divide both sides by 2.

`{x}^(2) = 9`

Take the square root of 9

Remeber square root solutions produce positive and negative Solutions.

`x = 3`

`x = - 3`