Use the quadratic model y=-4x²+8x+8 to predict y if x equals 100.

a) 40,808
b) 39,208
c) -40,792
d) -39,192

Astudent draws two parabolas both parabolas cross the x axis at (-4,0) and (6,0) the y intercept of the first parabolas is (0,-12). the y intercept of the second parabola is (0,-24) what is the positive difference between the a values for the two functions that describe the parabolas