Answer:
y=-x^2-4x
Step-by-step explanation:
y=ax^2+bx+c
0=a(0)^2+b(0)+c
c=0
0=a(-4)^2+b(-4)+0
0=16a-4b
0=48a-12b
3=a(-3)^2-3b
0=9a-3b-3
0=36a-12b-12
48a-12b=36a-12b-12
12a=-12
a=-1
16a=4b
4a=b
b=4(-1)
b=-4
y=-x^2-4x
Hope this helps. I did it a longer way because sometimes the width varies, but for this one there is a zero at x=0 and x=-4 and the slope is negative so you can do y=-x(x+4)=-x^2-4x. Anyways... have a nice night.
