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Ben
Mathematics
11 October, 15:21
If f (x) = x2 + 7; Find x if f (x) = 23
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Deangelo
11 October, 15:42
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x = 4, - 4
Step-by-step explanation:
f (x) = x^2 + 7
f (x) = 23
23 = x^2+7
Subtract 7 from each side
23-7 = x^2 + 7-7
16 = x^2
Take the square root of each side
±sqrt (16) = sqrt (x^2)
±4 = x
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