$\"\"$

The function $\"f\\left$ .

Find $\"\"$ $\"f\\left$ .

Substitute $\"x=a\"$ in $\"f\\left$ .

$\"f\\left$ .

$\"\"$

Find $\"f\\left$ .

Substitute $\"x=a+h\"$ in $\"f\\left$ .

$\"f\\left$

$\"f\\left$ .

$\"\"$

Find $\"\\frac{f\\left$ .

Substitute the values of $\"f\\left$ and $\"f\\left$ .

$\"\\frac{f\\left$

$\"=\\frac{\\frac{-a}{4}-\\frac{h}{4}+6+\\frac{a}{4}-6}{h}\"$

$\"=\\frac{-h}{4h}\"$

$\"\\frac{f(a+h)-f(a)}{h}=\\frac{-1}{4}\"$ .

$\"\"$

$\"f\\left$ .

$\"\\frac{f(a+h)-f(a)}{h}=\\frac{-1}{4}\"$ .