Answer:
x = 4, x = -4.
Step-by-step explanation:
We can start by adding 16 to both sides:
x^2 - 16 (+16) = 0 (+16).
This gives us x^2 = 16.
[tex]\sqrt{16}[/tex] = 4 and -4, so that is our answer.
Check:
4^2 -16 = 0.
4^2 = 16:
16 -16 = 0.
OR:
(-4)^2 - 16 = 0.
(-4)^2 = 16.
16 - 16 = 0.
So, our answer could be 4 or -4.
