Lets simplify the equation a little bit:

\begin{eqnarray} a &=& b + \frac{c}{d} \ d(a) &=& d\left(b + \frac{c}{d}\right) \ ad &=& bd + c \end{eqnarray}

You cannot simply choose what part to multiply $d$ by. You have to multiply the whole thing.

For further proof plug in your equation into wolfram alpha and it will simplify it for you.

Thursday, 21 November 2013 18:03 GMT