g(x) = 2x + 8 and f(x) = 1 / x+2 find g(f^-1(-2))
well that would = 3
and is it because when finding an inverse, you can just insert the number in the equation: -2 = 1 / x+2 is that how it works? that was the main thing i was having trouble with, that is finding what f^-1 was... how do you find what the inverse equation is?