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Locus Question

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annaconda:
I just want to ask, how do I find the focus of the equation, 8x^2+9y-72=0 ? I know the vertex is 0,8 but I don't know what to do next.

Thanks in advanced!! :)

MisterNeo:

--- Quote from: annaconda on September 10, 2017, 04:18:33 pm ---I just want to ask, how do I find the focus of the equation, 8x^2+9y-72=0 ? I know the vertex is 0,8 but I don't know what to do next.

Thanks in advanced!! :)

--- End quote ---


If it is -4ay, you subtract 'a' from the vertex y-value.
If it is 4ay, you add 'a' to the vertex y-value.
:)

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