Word problem

Question

Really need help with this, and by end of day today would be best 

 

The total imports of petroleum ( in millions of barrels per day) in a given year is approximated by the polynomial 40x^3 -526x^2+2089x+6056, where x represents the number of years since 1975. The corresponding total of exports of petroleum is -x^3 +13x^2 +29x+189. Write a polynomial that represents how many more barrels per day were imported than exported in a given year. 

Answer 1

Call the first polynomial I(x) and the second E(x), for imports & exports, respectively.

 

The difference, I(x) - E(x) is a polynomial representing the difference between imports and exports, i.e. you must simply subtract all the terms of E(x) from their corresponding ('like') terms in I(x), and that's the answer.

 

Note 'like' terms have the same exponent on the variable.