What is the missing polynomial?
[?] – (20 – 44 – 5x²) = 20 – 7x²
0 4x- 12x²
0 4x– 2x²
40-4x-12x2
40-4x-2x2

Astudent draws two parabolas on graph paper. both parabolas cross the x-axis at (–4, 0) and (6, 0). the y-intercept of the first parabola 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? write your answer as a decimal rounded to the nearest tenth