Answer:
[tex]x = 3[/tex]
or
[tex]x = - 3[/tex]
Step-by-step explanation:
Set up equation
[tex]2 {x}^{2} - 18 = 0[/tex]
Add 18 on both sides
[tex]2 {x}^{2} = 18[/tex]
Divide both sides by 2.
[tex] {x}^{2} = 9[/tex]
Take the square root of 9
Remeber square root solutions produce positive and negative Solutions.
[tex]x = 3[/tex]
[tex]x = - 3[/tex]
