# Problems with indices

• Sep 4th 2007, 08:22 AM
Coach
Problems with indices

((a^4)b)/(c^2)^^-1/2

Thank you!
• Sep 4th 2007, 08:26 AM
Krizalid
Not much you can do from there...

$\displaystyle \left(\frac{a^4b}{c^2}\right)^{-1/2}$

Is this thing you wanna reduce?
• Sep 4th 2007, 08:54 AM
Coach
Yes, I am sorry I do not know how to use tags.

I tried to take away the fractions by multiplying by a^2 and c, but I couldn't
• Sep 4th 2007, 08:58 AM
Krizalid
See the LaTeX Tutorial

Now, we have that $\displaystyle \left(\frac{c^2}{a^4b}\right)^{1/2}=\frac c{a^2\sqrt{b}}$

Does that make sense?
• Sep 4th 2007, 09:16 AM
Coach
Yes that makes sense, but according to my math book the answer is $\displaystyle \frac{c\sqrt{b}}{a^2 b}$ .
• Sep 4th 2007, 10:12 AM
Krizalid
Quote:

Originally Posted by Coach
Yes that makes sense, but according to my math book the answer is $\displaystyle \frac{c\sqrt{b}}{a^2 b}$ .

What's the matter? :D:D

Multiply numerator and denominator by $\displaystyle \sqrt b$ to my answer and you'll get the desired.