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anonymous
 one year ago
Where is the vertex of the parabola?
y = x2 + 2x – 3
a. above the xaxis
b. below the xaxis
c. on the xaxis
d. on the yaxis
anonymous
 one year ago
Where is the vertex of the parabola? y = x2 + 2x – 3 a. above the xaxis b. below the xaxis c. on the xaxis d. on the yaxis

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mathmate
 one year ago
Best ResponseYou've already chosen the best response.1complete the square and decide. f(x)=a(xh)^2+k if k=0, vertex is on the xaxis, k>0 it is above if h=0, vertex is on the yaxis, h<0 it is to the right.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I tried to do that, I can't figure it out

mathmate
 one year ago
Best ResponseYou've already chosen the best response.1I can give an example: For \(x^2+4x3\) \(x^2+4x3\) =\(x^2+2(2x)+443\) =\((x^2+2(2x)+4)7\) notice the perfect square on the left! =\((x+2)^27\) compare with f(x)=a(xh)^2+k so a=1, h=2, k=7 so the vertex (of this example) is to the left of the yaxis, and below the xaxis.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0thank you! I understand a lot better now!
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