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1/a² + 1/b² = (b²+a²)/a²b² =( (a+b)²-2ab )/ (ab)²
a+b = -2 ( rumus x1+x2 = -b/a)
a.b = -5 (rumus x1.x2 = c/a)
jadi = (-2)²-2(-5) / (-5)² = (4+10) / 25 = 14 / 25 jawaban D