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keliling = 2(5x - 3 + 2x + 4)
Keliling = 2 (7x + 1)
Keliling = 14x + 2
Luas = p x l
L = (5x-3) (2x+4)
L = 10x² + 20x - 6x - 12
L = 10x² + 14x - 12
K=2(5x-3+2x+4)
K=2(7x+1)
K=14x+2
b. L=p*l
L=(5x-3) *(2x+4)
L=10x^2+20x-6x-12
L=10x^2+14x-12