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50cm = 4x - 6 + 2x + 8
50cm = 6x + 2
48cm = 6x
x = 8
p=2x8-3
p= 13cm
l=8+4
l= 12cm
L= 12x13
L= 156 cm2
panjang = 2x-3
lebar = x+4
K = 50 cm
maka :
K = 2 x (2x-3 + x+4)
50 = 2 x (3x + 1 )
50 = 6x + 2
6x = 50-2
x = 48/6
x = 8 cm
jadi
panjang = 2x-3 = 2x8 - 3 = 13 cm
lebar = x+4 = 8+4 = 12 cm
jadi L = 13 x 12
= 156 cm²