PLZ HELP ITS NOT A DIFFICULT PROBLEM BUT I DONT UNDERSTAND WILL MARK BRAINLIEST FOR GOOD ANSWERS :) The instructions say to use foil or a generic rectangle and find the x-intercepts. Then sketch the parabola

1) y=x^2−2x−15

2) y=x^2+5x+6

3) y=x^2-6x-40

4) y=x^2-8x+12

Plz help and thank you so much if you do :)