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l = (3x + 1) cm
Dit : Luas ....??
Jwb : Luas = P . l
= (5x + 3) (3x + 1)
= 15x² + 5x + 9x + 3
= 15x² + 14x + 3
p= (5x + 3)
l= (3x+1)
luas persegi panjang = p × l
L = (5x + 3) (3x+1)
L =15x + 15 +3x + 3
L = 15x + 3x + 15 + 3
L = 18x +18