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题库 / GMATLA-PS-231
The function f is defined by ~$f\left ( x \right )=\sqrt{x}-10$~ for all positive numbers x. If u = f(t) for some positive numbers t and u. What is t in terms of u?
~$\sqrt{u+10}$~
~$\left ( \sqrt{u}+10 \right )^{2}$~
~$\sqrt{u^{2}+10}$~
~$\left ( u+10 \right )^{2}$~
~$\left ( u^{2}+10 \right )^{2}$~
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