sqrt{-25}*sqrt{-4}

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- Jun 3rd 2012, 08:30 PMpurplec16Multipling radicands
sqrt{-25}*sqrt{-4}

- Jun 3rd 2012, 08:44 PMReckonerRe: Multipling radicands
Note that the familiar property, $\displaystyle \sqrt a\sqrt b = \sqrt{ab}$ applies only to nonnegative $\displaystyle a$ and $\displaystyle b$. Instead, we have

$\displaystyle \sqrt{-25}\sqrt{-4}$

$\displaystyle =\left(i\sqrt{25}\right)\left(i\sqrt4\right)$

$\displaystyle =(5i)(2i) = 10i^2$.

Now, what is $\displaystyle i^2$? Simplify. - Jun 3rd 2012, 08:49 PMpurplec16Re: Multipling radicands
=-10

- Jun 3rd 2012, 08:50 PMpurplec16Re: Multipling radicands
What do you wrap the latex in? I am for some reason unable to do it/ find it?

- Jun 3rd 2012, 09:05 PMReckonerRe: Multipling radicands
- Jun 5th 2012, 04:51 AMpurplec16Re: Multipling radicands
Thank you!!!