Question

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

Answer 1

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.

`9x^2+18x=0`

`9x(x+2)=0`

`x=0 vv x=-2`