I have to determine the price that needs to be charged to obtain the largest revenue.

q=-p^2+33p+9 so
R=p(-p^2+33p+9) or =-p^3+33p^2+9p
I then need to take the derivative
R'=-3p^2+66p+9
Now I somehow need to solve for p to determine my price to obtain my largest revenue. How do I do this.

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-b +- sqrt(b^2+4ac) / 2a

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