Write about using a centimeter ruler to measure

Which of the following quartic functions has x = –1 and x = –2 as its only two real zeroes?

Ithink i know it but i want to be sure so can you me out ?

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