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please solve 4r^2-9=91

Algebra
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please solve 4r^2-9=91

Feb 14th, 2015

4r^2 = 91 + 9

4r^2 = 100

r^2 = 25

square root of both sides

sqrt(r^2) = +/- sqrt(25)

r = +/- 5

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Feb 14th, 2015

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