# Math Help - Expanding an expression

1. ## Expanding an expression

Can anyone help with this?

2. Originally Posted by dmfan2009
Can anyone help with this?

$\ln\left(\sqrt{x^4\sqrt{y^4\sqrt{z^2}}}\right)$

$\frac{1}{2}\ln\left(x^4\sqrt{y^4\sqrt{z^2}}\right)$

$\frac{1}{2}\ln(x^4) + \ln\left(\sqrt{y^4\sqrt{z^2}}\right)$

$\frac{1}{2}\ln(x^4) + \frac{1}{2}\ln\left(y^4\sqrt{z^2}\right)$

keep going ...

3. Remember, your properties of log says that $\log_{a}(MN)=\log_{a} M + \log_a{N}$.

To start, I would make your roots exponents. It would be $ln (x^\frac{4}{2} y^\frac{4}{4}z^\frac{2}{8})$.

So using that first property, we would have $ln \ x^\frac{4}{2} + ln\ y^\frac {4}{4} + ln\ z^\frac{2}{8}$.

Another property of logs says that $\log_{a}M^r = r\ log_{a}M$

So we could bring your exponents in front and it would look like
$\frac {4}{2} ln \ x + \frac {4}{4} ln \ y + \frac{2}{8} ln \ z$

You could essentially reduce your fractions, but it is easier to put back together into your original problem with the fractions not reduced.