# What is the domain of #(-3x^2)/(x^2+4x-45)#?

##### 1 Answer

Jun 19, 2015

The domain is all the real

#### Explanation:

In this division you must ensure to avoid a division by zero, i.e., to have a zero in the denominator.

The denominator is equal to zero when:

This is a quadratic equation that you can solve, say, using the Quadratic Formula.

So:

so you have two values of

These two values cannot be used by your function. All the other values of