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4x + 6 = 2x + 18
4x - 2x = 18 - 6
2x = 12
x = 6
diagonal = 4(6) + 6
= 24 + 6
= 30 cm
sisi persegi = diagonal / √2
= 30 / √2
=( 30 / √2) x ( √2 / √2 )
= 30/2 √2
= 15√2 cm
luas = sisi x sisi
= 15√2 x 15√2
= 450 cm²