dani698114 dani698114

07-03-2014
Mathematics

contestada

Whats the vertex form of y=x^2-20x+15

Respuesta :

07-03-2014

this looks like a parabola so:
y=x^2 - 20x + 15 --> x^2 - 20x +15=y
(x^2 -20x)=y - 15 --> (x - 10)^2=y - 15 +100 ( used complete the square)
(x - 10)^2=y + 85

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