Jawabanmu

2014-08-27T19:14:39+07:00
1. (3xy +1) (x^2 - y^2)
= 3x^3y -3xy^3 + x^2 - y^2

2. (x + 2) (x^2 +3x +5)
=x^3 + 3x^2 + 5x + 2x^2 + 6x +10
=x^3 + 3x^2 + 2x^2 + 5x + 6x +10
= x^3 + 5x^2 + 11x +10

ket
^ = pangkat