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# Rational Functions

A rational function can have a variable like "x" in the numerator AND the denominator. When this happens, there are some special rules and properties to consider.

# Square roots

Evaluate

$\sqrt{ 25 } .$

Which of the following is the positive square root of 144?

NOTE: The notation $$\sqrt{144}$$ means the same thing; that is, it indicates by default the positive square root. If both roots are desired the notation $$\pm \sqrt{144}$$ is used.

What is the positive square root of 1?

What is the positive square root of 9?

The positive square root of a number $$X$$ is 4. What is $$X$$?

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