Posted by zachary on Friday, November 2, 2012 at 5:09pm.
y = x(x+12)
so the x-intercepts are 0 and -12
and the x of the vertex must be halfway between those intercepts
x of vertex is -6
then y = 36 - 6(12) = -36
vertex is ((-6,-36), opens up, and has x-intercepts of 0 and -12
domain: obviously any value of x
range: y ≥-36
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