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Mathematics 9 Online
OpenStudy (anonymous):

which is the extraneous solution of -x = sqrt(2x +15)

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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