Multiple Choice Questions on If a amp b are the roots of the equation x sup2 px q 0 then the value of a sup3 b sup3 is ........ for CDS Exam Preparation

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Multiple Choice Questions

If a amp b are the roots of the equation x sup2 px q 0 then the value of a sup3 b sup3 is ........

Quantitative Aptitude (CDS) Quadratic Equations
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    If a & b are the roots of the equation x² + px + q = 0 then the value of a³+b³  is .

    3pq - p³ 

    Correct Answer

    2pq - p³

    Incorrect Answer

    3pq - q³

    Incorrect Answer

    2pq - q³

    Incorrect Answer
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    Explanation:

    a + b = -P/1= -P    , a . b =q 
    a³+b³  = (a+b)³-3ab (a+b)
    Put the value of (a+b) & ab we get = 3pq - p³ 

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