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a = 1
b = -6
c = 5
Ingat sifat-sifat ini :
x₁ + x₂= -b/a
x₁ • x₂= c/a
Maka :
x₁ • x₂ = 5/1
x₁ • x₂ = 5
Jadi, nilai dari x₁ • x₂ = 5