Find the value of (fg)(-1) if f(x) = x - 3 and g(x) = x² - 8x + 15. Is it simply plugging in the -1 into the f(x) then using the result as the input value for g(x)? Ex: f(-1) = (-1) - 3 or would it be more like this: (fg)(-1) = (x - 3)(x² - 8x + 15)?