Here's the question you clicked on:
alyssababy7
simplify the radical expression. (square root of 10/121)
\[\sqrt{\frac{10}{121}} = \pm \frac{\sqrt{10}}{11}\]
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The square of something is always positive. So the correct answer should be \(\frac{\sqrt{10}}{11}\).
ok... so \[\sqrt{\frac{10}{(-11)^2}} \neq \sqrt{\frac{10}{121}}\]
Sorry, I mean the square root of real numbers are always positive. Sources: http://mathworld.wolfram.com/SquareRoot.html http://en.wikipedia.org/wiki/Square_root