# Find the Domain f(x) equals three divide(x to the power of two minus two x minus fifteen)

Set the denominator in equal to to find where the expression is undefined.

Factor using the AC method.

Use the form. Find a pair of integers whose product is and whose sum is . In such a case, whose product is and whose sum is .

Use the integers to write the factored form.

Set equal to and Calculate .

Make the factor equal .

Add to both sides of the equation.

Set equal to and Calculate .

Set the factor equal to .

Subtract from both sides of the equation.

The solution is the result of and .

The domain is all values of that make the expression defined.

Interval Notation:

Set-Builder Notation:

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