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October 25, 2014

October 25, 2014

Posted by **Anonymousab** on Saturday, June 15, 2013 at 11:09pm.

(x-9)^2=81

- math -
**Reiny**, Sunday, June 16, 2013 at 8:09amThe way it sits, both sides are a perfect square, so yo simply take the square root of both sides.

(x-9) = ± 9

x = 9 ± 9

x = 0 or x = 18

or

you could expand it ....

x^2 - 18x + 81 = 81

x^2 - 18x = 0

x(x - 18) = 0

x = 0 or x = 18

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