Find the Domain f(x)=3/(x^2-2x-15)

Find the Domain f(x)=3/(x^2-2x-15)
Set the denominator in equal to to find where the expression is undefined.
Solve for .
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Factor using the AC method.
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Consider the form . Find a pair of integers whose product is and whose sum is . In this case, whose product is and whose sum is .
Write the factored form using these integers.
Set equal to and solve for .
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Set the factor equal to .
Add to both sides of the equation.
Set equal to and solve for .
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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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