Posted by Hannah on Saturday, February 5, 2011 at 11:46am.
What is the difference between the actual increase in profit as production increases from 5 to 6 units, and the marginal profit at a production level of 5 units where the profit function is given by
p(x)= 3x^2  5x + 2
First I plugged 5 into the equation and got 52. Then I took the derivative which is 6x 5 and plugged in 5 and got 25. 52  25 = 27. Is this correct?

Math(Please check)  helper, Saturday, February 5, 2011 at 12:48pm
No, you are not correct. But, you almost had it!
To compute the actual increase in profit, first plug in 5, then plug in 6. The difference between f(5) and f(6) is the actual.
p(x)= 3x^2  5x + 2
p(5) = 3(5)^2  5(5) + 2 = 52
p(6) = 3(6)^2  5(6) + 2 = 80
p(6)  p(5) = 80  52 = 28
To compute the marginal profit
dp/dx = 6x  5
6(5)  5 = 25
Actual  marginal = 28  25 = 3
Check my math
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