Mackenzie2013
  • Mackenzie2013
A company distributes its product by train and by truck. The cost of distributing by train can be modeled as −0.07x^2 + 40x − 105, and the cost of distributing by truck can be modeled as −0.03x^2 + 22x − 180, where x is the number of tons of product distributed. Write a polynomial that represents the difference between the cost of distributing by train and the cost of distributing by truck.
Mathematics
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SOLVED
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
katieb
  • katieb
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ybarrap
  • ybarrap
Take your 1st function: −0.07x^2 + 40x − 105 Then subtract the second function: −0.03x^2 + 22x − 180 What do you get?
Mackenzie2013
  • Mackenzie2013
What I got is not an answer choice.
ybarrap
  • ybarrap
show me what u got

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Mackenzie2013
  • Mackenzie2013
I just cleared it out haha I need to have a polynomial as an answer, I got a decimal number?
ybarrap
  • ybarrap
$$ −0.07x^2 + 40x − 105 - (−0.03x^2 + 22x − 180)\\ =−0.07x^2+0.03x^2+40x-22x-105-180\\ =(.03-.07)x^2+x(40-22)-285 $$ Can you do the rest?
Mackenzie2013
  • Mackenzie2013
this stuff confuseses me so much haha.. So I take _.(.03-.07_x^2+x(40-22)-285 as subtracting or adding? :S
ybarrap
  • ybarrap
Do the arithmetic within the parenthesis. Like this... $$ =-0.04x^2+18x-285 $$
Mackenzie2013
  • Mackenzie2013
−0.04x^2 + 18x − 285 the correct answer?

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