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p = (x+5)
l = (x+3)
L = panjang.lebar
L = (x+5)(x+3)
L persegi panjang = x^2 + 8x + 15
L persegi = x.x = x^2
L.persegi panjang = L.persegi
x^2 + 8x + 15 = x^2
8x + 15 = 0
8× = -15
x = -15/8
Maaf kalau salah