Below you can see a table set up to multiply two polynomials. What is the coefficient of the x3-term of the product?

http://i55.tinypic.com/2epkks0.png

Question

Below you can see a table set up to multiply two polynomials. What is the coefficient of the x3-term of the product?

http://i55.tinypic.com/2epkks0.png

anonymous · Answer

PLEASE HELP :/

anonymous · Answer

whaterver
$$(4x*-3x^2) +(2*x^3)$$

anonymous · Answer

-12x^3 + 2x^3  ... should be -10

anonymous · Answer

coefficient of x^3 = -10

jim_thompson5910 · Answer

there are two x^3 terms


They are: (4x)*(-3x^2) = -12x^3 and (2)*(x^3) = 2x^3


Add them to get: -12x^3 + 2x^3 = -10x^3


So the coefficient is -10

anonymous · Answer

I just don't get it ..

jim_thompson5910 · Answer

Fill out the table by multiplying each row by each column

jim_thompson5910 · Answer

you'll see that there will only be two x^3 terms in the table