If the cost, C, for manufacturing x units of a certain product is given by C=x^2+10+40 find the number of units manufactured at a cost of $7240.

Question

anonymous · Answer

7240 = x^2 + 10 + 40
simplify
7240 = x^2 + 50
simplify 
7190 = x^2
simplify
x = 84.8, but since we cant have 0.8 of a product, they only produced 84

anonymous · Answer

84 was no the right answered.... it was 80

anonymous · Answer

are you sure you got the original equation right then?

anonymous · Answer

I have another problem like that one...... to work......... I've be on this type of problem for over an hour now and can't not get the right answer

anonymous · Answer

it's weird that the equation you gave had 10+40, i suspect there may be an x in there somewhere, most equations dont leave 2 constants on the same side unsimplified like that

anonymous · Answer

here's the next one.... if the cost, C, for manufacturing x units of a certain product is given by C=x^2-5x+70, find the number of units manufactured at a cost of $8620

anonymous · Answer

8620 = x^2-5x+70
simplify
x^2-5x-8550 = 0
quadratic formula to solve
x = 95