Saturday

July 26, 2014

July 26, 2014

Posted by **ki** on Saturday, March 23, 2013 at 6:33pm.

factor

- math -
**Knights**, Saturday, March 23, 2013 at 10:05pmx^2 - 9

Difference of squares

(x+y)(x-y) = x^2-y^2

x^2 = x^2

y^2 = 3^2

So, we get (x+3)(x-3) as the answer.

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