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To find the x-intercepts, let y=0 and solve for "x", as follows:
Since the product is zero one of the factors is zero.
If x+3=0 then x=-3
If x-1=0 then x=1
x-intercepts are (-3,0) and (1,0)
Rewrite the equation as follows:
Complete the square, as follows:
Vertex is at x=-1, y=-4