# How do you simplify and state the excluded value for the Rational Expression (2a^2+10a)/(3a^2+15a)?

In this expression. you must avoid values of $a$ wich made the denominator equal to zero such as $a = 0$ and $a = - 5$;
$\frac{2 a \left(a + 5\right)}{3 a \left(a + 5\right)} = \frac{2}{3}$