Question

(2а-а2)-(а2+2а)
(3а2-а)* (-а)

Answer 1

$(2а-а2)-(а2+2а) = 2 a-2 a- left( 2 a+2 a right) = - left( 2 a+2 a right) = -4 a$

$(3a2-a)* (-a) = left( 6 a-a right) left( -1 right) a= -a left( 5 a right) = -5 a^2$

Answer 2

(2а-а2)-(а2+2а)=a2+2a