Help with negative exponents  TOPIC_SOLVED

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Help with negative exponents

Postby chrisfromNJ on Tue Feb 08, 2011 8:51 pm

Hello, all.

I am struggling to solve the following equation for r: w = Cr^-2

I started by dividing both sides by C: w/C = r^-2

Next, I converted the radical to a positive: w/C = 1/r^2

Now I can't remember what to do next. I need to solve for r. Am I off track?


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  TOPIC_SOLVED

Postby stapel_eliz on Tue Feb 08, 2011 10:09 pm

chrisfromNJ wrote:Next, I converted the radical to a positive: w/C = 1/r^2

There aren't any radicals in the equation. I'll guess you mean "the exponent"...?

chrisfromNJ wrote:Now I can't remember what to do next. I need to solve for r. Am I off track?

One method might be to flip both sides; if fractions are equal, then their reciprocals are equal.

Then solve the resulting quadratic equation from there, using whichever method you prefer. :wink:
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