Respostas

2014-07-22T11:33:07-03:00
A) x + x+1 = 47
    2x = 47 -1
    2x = 46
      x=  23
      x+1 = 23+1 = 24

R: 23 e 24

b) 2x+ 5
c) x² +3x =40
   x² + 3x -40 = 0
  Δ= 9 + 160
  Δ= 169
  x= -3 +-13
        2.1
 x¹ = 16/2 = -8
 x² = 10/2 = 5