<p>is there a rule to find the maximum value of a third degree equation through an interval</p>
<p>Best way to find the maximum is to find the derivative of the function. Find critical points and check whether they are local minima, maxima, or neither. The maximum will occur at a local maximum (if it exists) or at one of the endpoints of the interval.</p>
<p>For an SAT question just graph it and trace on TI. As MITer said, make sure to check the interval’s endpoints.</p>