3x^2 – 27 = 0 solve for x
x can be either positive or negative 3
Question|Rated good
Updated 8/2/2014 6:17:17 PM
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3x^2 – 27 = 0

3(x - 3) (x + 3) = 0;

3(x - 3) = 0;
3x - 9 = 0;
3x = 9;
x = 9/3;
x = 3

x + 3 = 0;
x = -3

x = {-3, 3}
Confirmed by yumdrea [8/2/2014 6:29:40 PM]

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