Question

Упростите выражения: a) 3a(a+1)+(a+2)(a-3)             b) (y-3)(5-y)-(4-y)(y+6)

Answer 1

а)3а^2+3а+а^2+2а-3а-6
4а^2+2а-6

Answer 2

б)5у-15-у^2+3у-4у+у^2-24+6н
10у-39

Answer 3

a) 3a(a+1)+(a+2)(a-3) =
= 3a^2+3a+ a^2-3a+2a-6 =
= 4a^2 + 2a - 6
      
b) (y-3)(5-y)-(4-y)(y+6) =
= (5y-y^2-15+3y)-(4y+24-y^2-6y)=
= 5y - y^2 -15 + 3y - 4y - 24 + y^2 +6y =
= 10y - 39