Question

  a, 4.(x+2)=2.(x-1)+4                              b,(x+1)+(2x+2)+(3x+3)+(4x+4)=80

Answer 1

a) 4.(x + 2) = 2 .(x - 1) + 4

=> 4x + 8 = 2x - 2 + 4

=> 4x + 8 = 2x + 2

=> 4x - 2x = 2 - 8

=> 2x = -6

=> x = -3

b) (x + 1) + ( 2x + 2) + (3x + 3) + ( 4x + 4) = 80

=> (x + 2x + 3x + 4x ) + (1 + 2 + 3 + 4) = 80

=> 10x + 10 = 80

=> 10x = 70

=> x = 7

Answer 2

a, 4.(x+2) = 2.(x-1) +4

  4x +8 = 2x-2+4

 4x-2x =-2+4-8

      2x = -6

        x = -3

b, (x+1)+(2x+2)+ ( 3x+3) + ( 4x+4) =80

 (x+1)+ 2 .(x+1) +3. (x+1) +4. (x+1) =80

(1+2+3+4) (x+1)=80

10.(x+1) =80

  x+1 =8 

  x=7