Respostas

  • Usuário do Brainly
2013-10-09T00:36:57-03:00
J)
-4x(x - 7) = 0
-4x = 0
x = 0

x - 7= 0
x = 7

k)
x = raiz de 20
x = +_ 2raiz5

l)
-5x(3x + 1) = 0
-5x = 0
x = 0

3x + 1 = 0
3x = - 1
x = -1/3