\(87.75 = R^2 - 7R \)

How to get \( R\) ?

I tried many times but i didn't get it

The answer is \(13.5\) but i don't know how to get it

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## Comments

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TopNewestUse the quadratic formula and solve for \(r\).

In fact you get two answers, 13.5 and -6.5

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Thx man, ur awesome

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my pleasure :)

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@Jason Chrysoprase You may refer to this wiki to learn them more effectively. :V Anyways, one typo, your heading; change it into Help:Algebra currently it is Help:Algera, ;P

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Keep learning. Your passion in math will pay off.

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