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OpenStudy (anonymous):
For f(x) = 2x + 8, find x when f(x) = -7
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Directrix (directrix):
f(x) = 2x + 8 f(x) = -7 For f(x), substitute -7 to get: -7 = 2x + 8 Solve that equation for x. @haahahahahahahaaaa
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