Which equation is y = 9x2 + 9x – 1 rewritten in vertex form?
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y=9x^2+9x+1
y+1/9=x^2+x
y+1/9=x^2+x-1/4+1/4
y+1/9+1/4=(x+1/2)^2
1/36[4y+13]=(x+1/2)^2
(x+1/2)^2=1/9[y+13/4)=]
vertex = (-1/2,-13/4)
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