cbrusoe
121+x^2=225 what does x equal?



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JamesWolf
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so you want to get the x on its own. try subtracting 121 from both sides first

cbrusoe
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104

JamesWolf
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yeah, x^2 = 104

JamesWolf
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now you need to get rid of the ^2

cbrusoe
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mmk how do i do that?

mickey4691
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what is the opposite of ^2?

JamesWolf
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okay well whats the opposite of squaring something?

mickey4691
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remember it's \[\pm \sqrt{104}\]

cbrusoe
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ooh nevermind went blank i would square root it making x = 10.2 right

CheetahBooks1
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121+x^2=225
121 121
x^2=104
square root x square root 104
X=10.2 approximately

JamesWolf
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yeah awesome :)

cbrusoe
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=) thankyou guys!!

mickey4691
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but it's gonna be a positive or negative 10.2

CheetahBooks1
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Aww man! she got it! oh well, congratulations! That's how you would show your work.

cbrusoe
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positive right...

cbrusoe
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lol thanks =)

CheetahBooks1
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It can actually be positive and negative!

JamesWolf
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could be either, but i doubt your teacher will care at this stage

mickey4691
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it can be positive and negative
check it wit the calculator
yu shud use positive for now

cbrusoe
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haha yeahh i got it right =) thanks again all of you

CheetahBooks1
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You are welcome!