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how to find focus of equation

what is the focus of
4x^2-25y^2=100

First - do you recognize that this is te hequatio of a hyperbola?You need to put the equation into the standard form for a hyperbola:

$<br /> \frac {x^2} {A^2} - \frac {y^2} {B^2} = 1<br />$

The focus can then be found from:

$<br /> C^2 = A^2 + B^2<br />$

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