Please help me on this problem

Hey am have account in but wished to create an account here you guys will me with my make new friends of uk !

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

Find the vertex for the parabola given by the function ƒ(x) = −3x2 − 6x.