Which is the graph of the equation?

Astudent draws two parabolas on graph paper. both parabolas cross the x-axis at (-4, 0) and (6,0). the y-intercept of thefirst parabola is (0, –12). the y-intercept of the second parabola is (0-24). what is the positive difference between the avalues for the two functions that describe the parabolas? write your answer as a decimal rounded to the nearest tenth.

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

Write as a product: ac^2–ad+c^3–cd–bc^2+bd