Question

(3ав+5а-в)-(12ав-3а)
2х^2(3-5x^3)
(2a-3в)(а+2в)

Answer 1

(3ав+5а-в)-(12ав-3а)=3ав+5а-в-12ав+3а=
=8а-в-9ав
2х^2(3-5х^3)=6х^2-10х^5
(2а-3в)(а+2в)=2а^2+4ав-3ав-6в^2=
=2а^2+ав-6в^2

Answer 2

1)$=3ab+5a-b-12ab+3a=-9ab+8a-b$
2)$=6x^2-10x^5=-10x^5+6x^2$
3)$=2a^2+4ab-3ba-6b^2=2a^2+ab-6b^2=2a^2-6b^2+ab$