Write the the function f(x) = -4x2 - 8x - 6 in the form f(x) = a(x - p) + q Now a = a so a b And p = 2a so p And since q is the last parameter to solve we may solve it by substituting any point on the curve: (0; c) is the y-intercept of the curve so: + q Therefore: f (20 ) = Videos