I get -15
6x^3*4 + 4x^2*3x + -7x*3x^2 + -5*6x^3
24+12-21-30 = -15
What is the coefficient of x^3 when
24x^4+6x^3+4x^2-7x-5
is multiplied by
6x^3+3x^2+3x+4
and the like terms are combined?
I got 144x^7+108x^6+90x^5+114x^4+24x^3 so the answer would be 24. But I am not sure if I am right.
2 answers
agree with Steve but most importantly look how he did it. It is not necessary to multiply the whole thing out, just the terms that end up being in x^3