Parabolas

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PARABOLAS

(x is mentioned several times in this article. x is an unknown number, especially in a horizontal line.)
xx=x²
Seems simple, right?
On a 2D graph, a parabola is a U-shaped curve. If x is one number, y is x². Here is how it looks like:
Click on the image to examine it closely. When you go to 2 on the number line, it reaches 4  on the vertical line. Since negative times a negative is positive, the same thing happens on the negative side of the graph. The x-intercept (where the function hits the x-axis) is 0.

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