# Math Help - Need a little Help

1. This question is part of the same test so i guess it has some type of relevance.

What type of formula or method do i use to solve this?

2. ## Re:

Re:

3. Originally Posted by qbkr21

4. D (i believe)
There is no right answer to 4, it should be |x|sqrt(y), as by convention sqrt()
is positive (for real positive argument), so sqrt(x^2 y) is by convention
positive, but x sqrt(y) has the same sign as x.

RonL

4. Originally Posted by CaptainBlack
There is no right answer to 4, it should be |x|sqrt(y), as by convention sqrt()
is positive (for real positive argument), so sqrt(x^2 y) is by convention
positive, but x sqrt(y) has the same sign as x.

RonL
ah yes. my bad. sqrt(x^2) = |x| by definition. you know that mistake messed me up in a proof class once, lost like 5 points, i should remember that

5. you guys are so pro at confusing me sometimes lol.

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