$\"\"$

The function is $\"\"$ .

Substitute $\"\"$ for $\"\"$ .

$\"\"$ .

Difference quotient of $\"\"$ $\"\"$ .

Substitute the values of $\"\"$ and $\"\"$ in $\"\"$ .

$\"\"$ $\"\"$

Rationalize the numerator.

Multiply the numerator and denominator by conjugate of the numerator.

$\"\"$

$\"\"$ .

$\"\"$

Difference quotient of $\"\"$ is $\"\"$ .