# Are there any numbers for which the expression (8x^4+9)/(9x^2+18x) undefined?

Jul 30, 2017

Yes. This expression is undefined for $x = 0$ and $x = - 2$

#### Explanation:

This expression is undefined for those values of $x$, for which the denominator is zero.

$9 {x}^{2} + 18 x = 0$

$9 x \left(x + 2\right) = 0$

$x = 0 \vee x = - 2$