Answer:
x = 7
Step-by-step explanation:
[tex]x^2 - 9 = 40[/tex]
Add 9 to each side:
[tex]x^2 = 49\\[/tex]
Take the square root of each side:
[tex]\sqrt{x^2} = \sqrt{49}[/tex]
[tex]x = 7\\[/tex]
7
Use this to help you solve it!!! Hope this helps.
