Asked by Lauren
I am supposed to graph this
y= -x^2+2x
he told us to coplete the square to get us the vertex, but how do i complete the square with a - in front of the x^2??
y= -x^2+2x
he told us to coplete the square to get us the vertex, but how do i complete the square with a - in front of the x^2??
Answers
Answered by
Damon
This way:
-x^2 + 2 x = y
x^2 - 2 x = -y
x^2 - 2 x + 1 = -y+1
(x-1)^2 = -(y-1)
vertex at (1,1)
negative sign means opens down (sheds water)
-x^2 + 2 x = y
x^2 - 2 x = -y
x^2 - 2 x + 1 = -y+1
(x-1)^2 = -(y-1)
vertex at (1,1)
negative sign means opens down (sheds water)
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