K = 4s
3x + 5 = 4(x - 1)
3x + 5 = 4x - 4
-x = -9
x = 9
----------
s = x - 1 = 9 - 1 = 8
L = s² = 8² = 64
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4x - 4 = 3x + 5
4x - 3x = 5 + 4
x = 9
sisi persegi : x - 1
= 9 - 1
= 8
luas persegi : sisi × sisi
= 8 × 8
= 64 cm
K = 4s
3x + 5 = 4(x - 1)
3x + 5 = 4x - 4
-x = -9
x = 9
----------
s = x - 1 = 9 - 1 = 8
L = s² = 8² = 64