Replace the variable with in the expression.

Simplify each term.

Add and .

Cancel the common factor of and .

Factor out of .

Cancel the common factors.

Factor out of .

Cancel the common factor.

Rewrite the expression.

Subtract from .

Rewrite as .

Pull terms out from under the radical, assuming positive real numbers.

Multiply by .

To write as a fraction with a common denominator, multiply by .

Combine and .

Combine the numerators over the common denominator.

Simplify the numerator.

Multiply by .

Subtract from .

Move the negative in front of the fraction.

The final answer is .

The result can be shown in multiple forms.

Exact Form:

Decimal Form:

Mixed Number Form:

Evaluate the Function f(7)=3/(x+2)- square root of x-3