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Verified answer
Kll persegi panjang = 2(p+l)42 = 2(3x-3+x+3)
= 2(4x)
= 8x
x = 42/8 = 5,25
panjang 3x-3 = (3×5,25)-3
= 15,75-3 = 12,75
lebar x+3 = 5,25 + 3= 8,25
luas = p×l
= 12,75×8,25 = 105,19