Answers

2014-08-25T20:48:50+08:00
You want to expand it, right?
Here's how:
 x^{2} -25
 \\ (x+5)(x-5)

If you're gonna ask why, it's because they're both squares and you need to follow the rule "Difference of two squares". Also, the square root x² is x and the square root of 25 is 5.
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2014-08-25T21:40:56+08:00