Question

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Answer 1

I remember doing this on my test... Do you know what extraneous and non-extraneous means?

Answer 2

The definition is: irrelevant or unrelated to the subject being dealt with
Basically it's an EXTRA solution. I look at it as it is... the word is EXTRAneous so you will have two solutions but only one of them will be correct

Answer 3

If it's NON-extraneous, than you won't have extra solutions

Answer 4

For Tristan's example, try solving: sqrt(x-1) = x -7

For Halley's example, try solving: sqrt(x-2) = 5

Answer 5

http://www.icoachmath.com/math_dictionary/extraneous_solution.html

Answer 6

just google extraneous equations and nonextraneous equations :)