Jawabanmu

2014-08-31T19:56:13+07:00
3x³ - 7x² + 12x² - 28x
3x³ + 5x² - 28x
1 5 1
2014-08-31T20:17:18+07:00
(X^2+4X) (3x-7)=
3x^3-7x^2+12x^2-28x
=3x^3+5x^2-28