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20 = 4(2x-1)
20 = 8x - 4
20 + 4 = 8x
24 = 8x
x = 3
sisi persegi = 2x - 1
sisi persegi = (2x3)-1 = 6 - 1 = 5
Luas persegi = s x s
Luas persegi = 5 x 5 = 25
s=20/4
s=5
Luas = s x s
= 5 x 5
= 25 cm²