Assuming you mean
c^2 = x^2 + 98√(x+57)
then
c^2(4) = 4^2 + 98√61
= 16+98√61
c(4) = 27.95
2c dc/dx = 2x + 49/√(x+57)
at x=4, we have
55.90 dc/dx = 8+49/√61
dc/dx = 0.255
Of course, I might have misread the function, with all those pesky words instead of nice math notation ...
Cost: C^2=x^2+98*sq rt of x + 57
Revenue:890(x-4)^2+29R^2=26,100
Find the marginal cost dC/dx at x=4
1 answer