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April 16th, 2014, 04:21 AM   #1
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Canceling fractions

Hello!

Why can I only cancel in this way:

π‘₯=(4±√4 √10)/2 -> π‘₯=(4Β±2 √10)/2

and not this

=(2±2√10)/2

The question is why the denominator terminates only to the two of the numerator and not to the four?
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April 16th, 2014, 05:24 AM   #2
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There is no cancelling there. It’s just $\sqrt4=2$.
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April 16th, 2014, 09:59 AM   #3
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Quote:
Originally Posted by chrie View Post
why can i only cancel in this way:
π‘₯=(4±√4 √10)/2 -> π‘₯=(4Β±2 √10)/2
and not this
=(2±2√10)/2
π‘₯=(4Β±2 √10)/2 = 2(2 Β± √10)/2 = 2 Β± √10
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