A function is defined as f(x)=x^2-3x+4. What expression can be used to describe f(2x)? Express your answer in simplified form in terms of x.
plug in 2x for every x in f(x) = x^2-3x+4
That leaves us with f(2x) = (2x)^2 -3(2x) + 4 = 4x^2 - 6x + 4