Question 177945
c
x=-3 is the only zero for the parabola
(x+3)^2=0
x^2+6x+9=0 is a possible quadratic equation but it is open at the top.
-(x+3)^2=0
-x^2-6x-9=0 is a correct equation
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Ed
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{{{graph(500,500,-10,10,-10,10,-x^2-6x-9)}}}