Answer:answer is B
Step-by-step explanation:
Here,
f(x) = 7
x = ?
Now,
f(x) = x^2 - 2
or, 7 = x^2 - 2
or, 7 + 2 = x^2
or, x^2 = 9
◆ x = 3
a) 3
I hope it's help you...
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