Scott Woodbury-Stewart

GMAT OFFICIAL GUIDE PS – The function f is defined by f(x) =…

The function f is defined by f(x) =…

Solution:

We are given the function defined by f(x) = √x – 10, and we also see that f(t) = u. First, let’s determine what f(t) looks like and then set the result equal to u.

f(t) = √t – 10

√t – 10 = u

To finish, we need to get t in terms of u.

√t = u + 10

t = (u + 10)^2

Answer: D

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