1) (y-4)(y+5) 2) (3a-2b)(5a-b)

Question

1) (y-4)(y+5) 2) (3a-2b)(5a-b)

Answer 1

Раскроем скобки:
(у-4)(у+5)=у^2+у-20
(3а-2в)(5а-в)=15а^2-3ав-10ав+2в^2=
15а^2-13ав+2в^2