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p2 = (x+5)
maka L1 = p1 kali p1= (x+8)(x+8) = x² + 16x + 64
maka L2 = p2 kali p2= (x+5)(x+5) = x² + 10x +25
jadi selisih luas kedua persegi adalah x²+16x + 64 dikurangi x² +10x +25 = 6x + 39