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| Math Central | Quandaries & Queries |
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Question from Max, a student: How do I graph y = -2x^2? |
Hi Max,
I would start by plotting some points. Let me show you with y = -x2 + 1. I chose values x = 0, 1, -1, 2 and -2 and for each I found the value of y using y = -x2 + 1.
| x | y |
|---|---|
| 0 | 1 |
| 1 | 0 |
| -1 | 0 |
| 2 | -3 |
| -2 | -3 |
Then I plotted these points on an xy coordinate system
Then I sketched a graph through these points
Now try your example,
Penny
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