f(x) = x² - 1
f(x) = 99
We need to find a value of x for which the function is equal to 99, so:
x² - 1 = 99
Solving for x:
Add 1 to both sides:
x² -1 + 1 = 99+1
x² = 100
take the square root of both sides:
√(x²) = √(100)
x = ± 10
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