Skip to content / Đến nội dung
ThichHocToan.com

MathNet 2016-part-05 — 184 problems (EN–VI) Question 113

Math Olympiad Vault · MathNet 2016-part-05 — 184 problems (EN–VI)

Question 113

Let $f(x)=\frac{1}{\sqrt{a^{x}}}$, $a\gt 0$ and $a \neq 1$. What is $f\left(\log _{a} 4\right)$?

(A) $2$
(B) $-\frac{1}{2}$
(C) $\frac{1}{2}$
(D) $-4$
(E) $-2$