Question

y^3-5y=3+y^2

agora vai essa

Answer 1

y³-5y=3+y²
y³-5y-3-y²=0
y³-y²-5y-3=0
y³+y²-2y²-2y -3y -3 =0
y². (y +1) - 2y . (y +1) - 3 . (y +1)=0
(y +1) . (y²-2y-3) = 0
(y +1) . (y² + y-3y - 3) = 0
(y+1) . (y . (y+1) - 3 (y+1) =0
(y+1) . (y+ 1) . (y-3) =0
(y+1)² . (y-3) = 0
(y+1)² =0
y-3=0
R:
y= -1
y=3