The functions f and g are defined by f(x) = 4x and g(x) = x^2. For what value of x does f(x)....

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April 2018 SAT QAS Section 4 Question 7:

The functions f and g are defined by f(x) = 4x and g(x) = x^2. For what value of x does f(x) - g(x) = 4 ?
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