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Question 1
If the function $f:[1,\infty)\to[1,\infty)$ is defined by $f(x)=2^{x(x-1)}$, then $f^{-1}(x)$ is:
A.
$\left(\dfrac12\right)^{x(x-1)}$
B.
$\dfrac12\left(1+\sqrt{1+4\log_{2}x}\right)$
C.
$\dfrac12\left(1-\sqrt{1+4\log_{2}x}\right)$
D.
not defined
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