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l = 2x-2
k = 54
k = 2(p + l) p = 3x+4 = 3(5) + 4 = 19
54 = 2 (3x+4 + 2x-2)
54 = 6x+8 + 4x-4 l = 2x-2 = 2(5) - 2 = 8
54 = 10x + 4
54-4 = 10x
50 = x jadi, luas persegi panjang
10 L = pxl
= 19 x 8
5 = x = 152
maaf kalau salah
54 = 2 ( 5x + 2)
54 = 10x + 4
54 - 4 = 10x
50 = 10x
50/10 = x
5 = x
panjang = 3x + 4
= 3(5)+4
= 15+4
= 19
lebar = 2x - 2
= 2(5) - 2
= 10 -2
= 8
luas = p x l
= 19 x 8
= 152 cm²
jawabannnya adalah 152 cm²