Multiple Choice Questions on If x 2 22 3 21 3 then what is the value of x3 minus 6x2 6x ........ for CDS Exam Preparation

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Multiple Choice Questions

If x 2 22 3 21 3 then what is the value of x3 minus 6x2 6x ........

Quantitative Aptitude (CDS) Algebra
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    If  x = 2 + 22/3 + 21/3 , then what is the value of  x3 − 6x2 + 6x ?

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    Explanation:

    As  x = 2 + 22/3 + 21/3 ,
    =>(x - 2)= 22/3 + 21/3  -------------------------------(i)
    =>(x - 2)3= (22/3 + 21/3 )3
    =>x3 - 8 - 6x2 + 12x =4+2+3*22/3 * 21/3(22/3 - 21/3)
    =>x3 - 8 - 6x2 + 12x=8-6
    =>x3 - 8 - 6x2 + 12x=2

    By: Munesh Kumari
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