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OpenStudy (anonymous):
Is this correct...?
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OpenStudy (anonymous):
OpenStudy (gschibby):
Well, the i in there kinda messes everything up, so...neither of them I would say :P
OpenStudy (gschibby):
the correct answer should be \[9x^{2}-9i^{2}\]
OpenStudy (anonymous):
Thank you lol invisible numbers... i2 = -1 so I plugged -1 in... so it will still equal 9x^2+9
OpenStudy (gschibby):
Of course! Silly me :P
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OpenStudy (gschibby):
Yes, then you got it right the first time ;)
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