$\"\"$

Consider a function that does not have inflection point at $\"\"$ and $\"\"$ .

Let the function is $\"\"$ .

Apply derivative on each side with respect to $\"\"$ .

$\"\"$ .

Apply derivative on each side with respect to $\"\"$ .

$\"\"$

Find the inflection points by equating $\"\"$ .

$\"\"$

Substitute $\"\"$ in $\"\"$ .

$\"\"$

The function does not have the inflection points at $\"\"$ , since the function has a critical number at $\"\"$ .

Graph the function.

$\"\"$

$\"\"$ .