Question

(y-4) elevado a 2 - (2y-5) elevado a 2 +2(y+2).(y-2) RESOLVA:

Answer 1

(y-4)²-(2y-5)²+2.(y+2).(y-2)

Desenvolvendo 

(y-4).(y-4)-(2y-5).(2y-5)+2(y²-2y+2y-4)
y²-4y-4y+16-4y²-10y-10y+25+2y²-8
-y²-28y+33