Question

( 12у 2 + 4у ) +( - 3у 2 – 6у + 5 )

Answer 1

$(12y^2+4y)+(-3y^2-6y+5)=12y^2+4y-3y^2-6y+5=9y^2-2y+5$

Answer 2

(24у+4у)+(-6у-6у+5)
(28у)+(-12у+5)
28у-12у+5
16у+5