Question 604295: whats the vertex form of the graph y=x^2+4x-1
Answer by lawdej(58)   (Show Source):
You can put this solution on YOUR website! use completing the square
x^2+4x=y+1
X^2+4x+4=y+1+4
(x+2)^2=y+5
vertex=(-2,-5)
or use the following formula
(-b/2a,((4ac-b^2)/4a)
a=1,b=4,c=-1
(-b/2a,(4ac-b^2/4a)=(-4/(2x1),((4x1x(-1)-4^2)/(4x1))
=(-4/2,(-4-16)/4)=(-2,-20/4)=(-2,-5)
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