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Mathematics 18 Online
OpenStudy (anonymous):

solve x2-4=12

OpenStudy (luigi0210):

move the 12 to the other side

OpenStudy (anonymous):

ok, wouldn't i move the 4 over and then i want to say square the x

OpenStudy (anonymous):

4+x2-4=12+4 x2=16?

OpenStudy (luigi0210):

Oops, sorry I made a mistake. Move the 4 over and then take the square root of that.

OpenStudy (luigi0210):

Yes, there you go :P

OpenStudy (anonymous):

x=8 right?

OpenStudy (luigi0210):

Nope, you're taking the square root not dividing.. big difference

OpenStudy (anonymous):

ok this is hard without my calculator... smh

OpenStudy (luigi0210):

Ha, here I'll give you a hint.. *cough* 4 *cough*

OpenStudy (anonymous):

lol thanks. I lost my graphing calculator. it's also been a year since I touched math so ur a LIFESAVER!

OpenStudy (luigi0210):

Naw >.> btw when you take the square root of anything you have two answers, a positive and negative. \[x= \pm4\]

OpenStudy (anonymous):

That does sound familiar. ok thanks for the tip!

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