Question

qual resposta (7y³-2y²+3y-5) + (y³-4y+9)-(5y³+4y²-y+1)

Answer 1

(7y³-2y²+3y-5) +(y³-4y+9) - (5y³+4y²-y+1)

Fazendo o jogo de sinais:
-5y³
-(+4y²)= -4y²
-(-y)= y
-(+1)= -1

7y³-2y²+3y-5+y³-4y+9-5y³-4y²-y-1
7y³+y³-5y³-2y²+4y²+3y-4y-y-5+9-1
3y³+2y²-2y+3.Espero ter ajudado