Respostas

2013-05-05T20:42:46-03:00

subtitui onde tem x , 5

 

f= (5+2) - 4(5+3)

f= (7) - 4(8)

f = 7 - 32

f=-25

2013-05-05T20:44:28-03:00

f = 3(x+2) -4(x+3)

f = 3x+6-4x+12

f=-x+18

x=18