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April 21, 2014

April 21, 2014

Posted by **Betty** on Friday, January 20, 2012 at 8:10pm.

- Algebra -
**Steve**, Saturday, January 21, 2012 at 12:16am√x+2 - x = 0

√x+2 = x

x+2 = x^2

x^2 - x - 2 = 0

(x-2)(x+1) = 0

check for validity

√(2+2) - 2 = 2-2 = 0 ok

√(-1+2) - (-1) = 1 - (-1) = 2 nope

Note that if you had taken the minus √, it would have been ok. But √4 does not mean ±2 - it's just 2.

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