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using square roots how do I solve 3x squared +12=0

3xsquared+12=0 how to solve using square roots
 

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Luke R. | Economics, Math, SAT, LSAT, American History, Gov't/PoliticsEconomics, Math, SAT, LSAT, American His...
5.0 5.0 (2 lesson ratings) (2)
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1. 3x2+12=0
2. 3x2=-12 --> isolate the variable x
3. x2=4 --> divide out the 3
4. x=2 & x=-2 -->take the square root of x2 and 4, remember both 2and -22 equal 4.
 
Hope this helps.

Comments

You are awesome...the way you explain rather then just work out the problem was what I needed to help my son! Thank you.
The third step is wrong: it should be x2=-4
thus the subsequent results are wrong.