Thread: rational expression

1. rational expression

find any values for which the rational expression is undefined

4x+5 / x^2+3x+2

2. Assuming you mean
$\dfrac{4x+5}{ x^2+3x+2}$

...this expression would be undefined if the denominator equals 0:
$x^2+3x+2 = 0$

Can you take it from here?