Can you find the change in profit P for the given marginal?

Question

Find the change in profit P for the given marginal. Assume that the number of units x increases by 4 from the specified value of x. (Round your answer to two decimal places.)

Marginal: dP/dx = 12.2(55 - 3 "radical x")

Number of units x: x = 122

Answer 1

P'(122)=12.2(55-3√122)=266.74

P'(122+4)=P'(126)=12.2(55-3√126)=260.17

The change, rounded to two decimal places, is -6.57.