Hi,

I know te following equation simplifies as shown, but how?? I also know I should know this but I don't!

$\displaystyle \frac{ (\ln{x})(4x^3)-(x^4)(1/x)} {(ln{x})^2} $

= $\displaystyle \frac{x^3(4\ln{x}-1)}{(\ln{x})^2} $

Many thanks in advance.