Question

Resolva as equações a seguir. a) 18x-43=65 b)23x-16=14-17x c)10y-5(1+y)=3(2y-2)-20 d)x(x+4)+ × (x+2)=2x+12

Answer 1

a) 18x = 65 - 43   
   18x = 22
    x = 22/ 18
    x = 11/ 9

b) 23x = 14 - 17x + 16
    23x + 17x = 14 + 16
   40x = 30
     x = 30 / 40
     x = 3/4

c) 10y -5y + 5 = 6y - 6 - 20
   10y - 5y - 6y = - 6 - 20 -5
  5y - 6y = - 31
    - 1y = - 31
      y = - 31 / - 1
      y = 31

d) x2 + 4x + x2 + 2x = 2x + 12
   x2 + x2 = 2x -4x -2x + 12
  2x2= - 2x - 2x +12
2x2 = - 4x +12
2x2 +4x - 12 =0
(4.4) - 4 .(2 ). (-12)
16 +    96
x = 112