Question

3x(x+1)-x=33-(x-3)▪2ao quadrado

Answer 1

3x(x+1)-x = 33-(x-3).2^2 aplica distributiva
3x^2 + 3x - x = 33 - 4x -12 faz as somas
3x^2 +2x = 21 -4x
3x^2 +2x +4x = 21
3x^2 +6x -21 = 0