Find b and c so that the parabola with equation y = 4x2 - bx - c has a vertex at (2 , 4)?	Choose the correct choice
A) -10 B) -20 C) -30 D) -40 E) -50
h = b / 8 = 2 : formula for x coordinate of vertex   b = 16 : solve for b   y = 4 for x = 2 : the vertex point is a solution to the equation of the parabola   4(2)2 - 16(2) - c = 4   c = -20 : solve for c   correct answer -20
<result>B</result>
Find b and c so that the parabola with equation y = 4x2 - bx - c has a vertex at (2 , 4)?