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July 19th, 2015, 04:56 AM   #1
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write radical expression in simplest form

the expression is



these are my steps:



however in the book the answer is :



why are not the absolute value bars surrounding the y?

Last edited by mick7; July 19th, 2015 at 05:00 AM.
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July 19th, 2015, 08:41 AM   #2
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Quote:
Originally Posted by mick7 View Post
the expression is



these are my steps:



however in the book the answer is :



why are not the absolute value bars surrounding the y?
Your original expression contains $\displaystyle \sqrt{y}$. This means that y has to be positive, so absolute value bars aren't needed.

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