What are the domain restrictions of a + 1 / a^2-5a-36?

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Mathematics

Justus Allison

Today, 21:10

What are the domain restrictions of a + 1 / a^2-5a-36?

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Celeste · Answer 1

All real numbers except - 4 and 9.

The domain of an expression is the range of all values for which the expression is defined. Looking at the expression, it will legal everywhere except when a^2 - 5a - 36 is equal to 0. Since that's a quadratic equation, we can use the quadratic formula to find where its value is 0, giving - 4 and 9.

Therefore the domain of the expression is, All real numbers except - 4 and 9.