Factoring a Polynomial using graph

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mikexz

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I heard that you can find out the formula a function by simply looking at the x-intercepts of the graph, equating those to zero and multiplying them together. But what if I have something that doesn't have any x intercepts?? or has been shifted up? e.g. x^2+5 or 6x^8 +5

How do I find it's formula then? (basically how to find the formula of a function with it's graph)

thanks
 
mikexz said:
I heard that you can find out the formula a function by simply looking at the x-intercepts of the graph, equating those to zero and multiplying them together.
Click to expand...
If, by "formula a function", you mean "the polynomial function", then the answer is, "sort of, and only for polynomials, and you need one exact point off the x-axis also, and you'd better hope the x-intercepts are either 'nice and neat' or else given to you exactly, because otherwise you're hosed". :shock:

For further information, try the following:

. . . . .Finding Polynomials From Their Zeroes

Have fun! :D

Eliz.
 
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