α and β are the zeros of the polynomial ax2+bx+c then 1/α²+1/β²
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Since α and β are zeroes.....
➜β+α = -b/a
➜α.β = c/a
To find the value of..... 1/α² + 1/β²
1/α² + 1/β² = (1/α + 1/β)² - 2/βα
= (α+β/αβ)² - 2/αβ
= (-b/a / c/a)² -2/ c/a
= (-b/c)² -2a/c
= -b²/c² - 2a/c
= -b²-2a(c) / c²
= -(b² +2ac) / c²
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