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    If α and β are the roots of the equation x2+5x+6=0, then the value of  αβ - (1α\frac1αα1​ + 1β\frac1ββ1​​) is:
    Question

    If α and β are the roots of the equation x2+5x+6=0, then the value of  αβ - (1α\frac1α1β\frac1β​) is:

    A.

    316\frac{-31}6​​

    B.

    316\frac{31}6​​

    C.

    416\frac{41}6​​

    D.

    416\frac{-41}6​​

    Correct option is C

    Given:

    The quadratic equation is x2+5x+6=0
    Roots are α and β
    We need to find the value of αβ - (1α\frac1\alpha​+1β\frac1β​)

    Formula Used:

    For equation ax2+bx+c=0ax^2 +bx+c = 0  

    Sum of roots = ba\frac{-b}{a} 

    Product of roots = ca\frac{c}{a}​​

    Solution: 

    x2+5x+6=0 

    Now, 

    α+β = -ba\frac{b}a = -51\frac51 = -5

    αβ = ca\frac{c}a = 61\frac61 = 6 

    So, 

    αβ − (1α\frac1α​+1β\frac1β

    = αβ − α+βαβ\frac{α+β}{αβ} 

    = 6 - 56\frac{-5}6 

    = 6 + 56\frac56​ 

    36+56\frac{36+5}6 

    = 416\frac{41}6​​

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