Get some more brainliest here

Suppose that the price p (in dollars) and the weekly sales x (in thousands of units) of a certain commodity satisfy the demand equation 4p cubedplusx squaredequals38 comma 400. determine the rate at which sales are changing at a time when xequals80, pequals20, and the price is falling at the rate of $.20 per week.

It says factor each expression completely 8y+48

In which direction does the left side of the graph of this function point? f(x) = 3x3 - x2 + 4x - 2