The function f is defined by subtracting 25 from the square of a number and the function v is defined as the square root of one-half of a number. If v(f(x))=10, then which of the following is a possible value of x? Choose the correct answer:
A) -15 B) -5 C) 0 D) 5 E) 25
f(x) = x^2-25   v(x) = sqrt(x/2) not sqrt(x)/2, because the question clearly says its square root of (half of the number).   v(f(x)) = 10   v(x^2-25) =10   sqrt((x^2-25)/2) = 10   =&gt; (x^2-25)/2 = 100   =&gt;x^2 = 225   =&gt; x = 15 or -15   -15nswer is -15.
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The function f is defined by subtracting 25 from the square of a number and the function v is defined as the square root of one-half of a number. If v(f(x))=10, then which of the following is a possible value of x?