SOLUTION: we're doing parabolas at the moment. I need to know how to find the turning point of a parabola, when the equation is (x-2)(x+2) for example. How do I substitute it in with the lin

Question 771158: we're doing parabolas at the moment. I need to know how to find the turning point of a parabola, when the equation is (x-2)(x+2) for example. How do I substitute it in with the line of symmetry??
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!
Assuming you mean, like , the "turning point" would be the vertex, either a maximum point or a minimum point. Your example allows you to quickly find horizontal number line intercepts; the x value for the vertex will be in the exact middle of these horizontal x intercepts.

x-intercepts, the "zeros" of y:

Either x=2 or x=-2
THOSE are the x-intercepts, where y=0, where parabola crosses the x-axis.

What is x at the vertex?

is the coordinate for the vertex.

What is y coordinate at the vertex?

MEANING: the vertex of this parabola is (0, -4)
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