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OpenStudy (anonymous):
log[x](16)=4
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Directrix (directrix):
x = 2 By definition, this expresssion translates to x^4 = 16. x^4 - 16 = 0 (x^2 +4) (x^2-4) = 0 (x ^2 +4) = 0 NO real roots so, x^2 - 4 = 0 and x = 2 or -2. -2 is exraneous leaving x = 2.
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