Thread: Calculate intervals - cost and revenue function

Cost and revenue function, calculate the intervals where the profit is increasing?

C(x) = 0.32x^2 - 0.00004x^3
R(x) = 0.848x^2 - 0.0002x^3

Im lost!!

the profit function is the difference between cost and revenue, so


simplify terms in brackets...


now can you use the methods you have been taught to find the values of x where P(x) is increasing?