Jawabanmu

2014-03-24T17:31:44+07:00
2 kali x+1 +3x-4 = 34
2 kali 4x - 3 = 34
8x -6 = 34
8x = 40
x = 5
panjang = x + 1 = 6 cm
lebar = 3x-4 = 11 cm
luas p × l = 11×6 = 66 cm
2014-03-24T17:33:44+07:00
2p + 2l = 34
2(x+1)+2(3x-4) = 34
2x+2+6x-8 = 34
6x-6 = 34
6x = 34+6
x = 40/6
x = 6,67 cm

p = x+1 -> 6,67+1 -> 7,67
l = 3x-4 -> 3(6,67)-4 -> 20,01-4 ->16,01
L = p.l
L = 7,67.16,01
L = 122,7967 cm²

maaf kalau salah:)