Cost function=xp+Nb+24NC/x please and thank you !

10. Compute the derivative of your cost function in Problem 9. The derivative function will contain one or more of the letters x, N, P, b, c. 11. Determine any critical points of the cost function. SHOW WORK. Your answer should be of the form, x= expression, where "expression" is an expression involving one or more of the letters N, P, b, and c (not x). Remark Check that your critical point is correct by using the values N=1,200,000; P = 5,000; b = 1; and c = 0.01 and verifying you get the same value as the critical point you computed in Part I. If not check your work as you have an error. Include your work performing this check in your paper