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1/α² + 1/β² = (α² + β²)/(αβ)²
= ((α+β)² - 2.αβ)/(αβ)²
= ((-b/a)² - 2.(c/a))/(c/a)²
= ((-5/3)² - 2.(1/3))/(1/3)²
= (25/9 - 6/9)/(1/9)
= 19.........................opsi A