sexta-feira, 28 de abril de 2017

EE22

Exercício de Exame Nacional
EQUAÇÕES DO 2ºGRAU

9ºano




3 comentários:

  1. (x+ 1)2 = 1-3x = x2 + 2×1×=
    =x + 1 2 = 1-3x = x2 + 2 x + 1 = 1 -3x=
    =x2 + 2x+ 1-1 + 3x = 0 = x2+ 5x= 0 = x + 5 = 0 =
    = x = 0 - x + 5 = 0 x = 0 ∨ x = -5
    R: =-5,0

    ResponderEliminar
  2. (x+1)^2 = 1-3x

    (=) x^2 + 2(x+1) + 1^2 = 1-3x
    (=) x^2 +2x + 1^2 = 1-3x
    (=) x^2 +2x + 1 = 1-3x
    (=) x^2 +2x +3x = 1-1
    (=) x^2 +5x = 0
    (=) x(x +5) = 0

    x= 0 V x+5 = 0
    x= 0 V x = -5

    ResponderEliminar