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If x+y= 7 & xy=12 then …

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If x+y= 7 & xy=12 then the value x³ +y³

    • Posted by Tarani Balaji 6 years, 4 months ago

    CBSE > Class 08 > Mathematics
    • 2 answers

    Gaurav Seth 6 years, 4 months ago

    Q: If x+y= 7 & xy=12 then the value x³ +y³

    Explanation is as follows:

    (x+y)^3=x^3+3x^2y+3xy^2+y^3

    = x^3+y^3+3xy(x+y)

    x^3+y^3=(x+y)^3-3xy(x+y)

    = (12)^3-3(27)(12)

    =1728-972

    x^3+y^3=756
     

    0Thank You

    Renuka Seiwal 6 years, 4 months ago

    (X+y)(x+y)=7×7=49,2xy=2×12=24, So the ans is 49-24=25,by formula

    0Thank You

    ANSWER
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