Answer:
d.) the only solution is 9.
Step-by-step explanation:
The only way to solve this equation is to get the square root:
x^2 = 81
[tex]\sqrt{x^2}[/tex] = [tex]\sqrt{81}[/tex]
x = 9
The square root of 81 is 9 and the square root of x^2 is just x.
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