Jika a dan b akar akar persamaan kuadrat x² - 2x + 3=0 nilai dari a/b + b/a adalah
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a+b=2
a.b=3
a/b + b/a = a²/ab + b²/ab
= (a²+b²)/ab
= ((a+b)²-2ab)/ab
= ((2)²-2.3)/3
= (4-6)/3
= -2/3