how is this: (4+x^2)/sqrt(4+x^2)

the same as sqrt(4+x^2)

?? could someone explain step by step? thanks :)

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- Dec 2nd 2010, 11:04 AMsituationsimple rearrangement which i cant do!
how is this: (4+x^2)/sqrt(4+x^2)

the same as sqrt(4+x^2)

?? could someone explain step by step? thanks :) - Dec 2nd 2010, 11:13 AMtonio
- Dec 2nd 2010, 11:14 AMe^(i*pi)
If you let $\displaystyle u = \sqrt{4+x^2}$ then you get $\displaystyle \dfrac{u^2}{u}$ which is u.

Alternatively, recall that $\displaystyle a = \sqrt{|a|}\sqrt{|a|}$ - Dec 2nd 2010, 11:15 AMharish21
- Dec 2nd 2010, 11:16 AMsituation
- Dec 2nd 2010, 11:17 AMsituation