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OpenStudy (anonymous):
which is the extraneous solution of -x = sqrt(2x +15)
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OpenStudy (anonymous):
|dw:1427779962002:dw|
OpenStudy (anonymous):
i know x= -3, but i have no idea how to get the extraneous solution
OpenStudy (anonymous):
Ive looked it up and it seems that the extraneous solution is a solution you comes up with that is actually wrong because it doesnt work when you replace the variable, but ive only come up with -3 and it works
Miracrown (miracrown):
To see how the extraneous solution comes about, let's first square this equation to clear the radical on the right side:
Miracrown (miracrown):
|dw:1427780341090:dw|
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