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X+y=12 and xy= 27 then x3 …

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X+y=12 and xy= 27 then x3 + y3 is

    • Posted by Mananp Amreliya 14 Jnv Bha 4 years, 7 months ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Raktim Kundu 4 years, 7 months ago

    x³ + y³ =(x + y)(x² + y² - xy) =12(x² + y² + 2xy - 2xy - xy) =12{(x + y)² - 3xy} =12{(12)² - 3 × 27} =12{144 - 81} =12 × 63 =756 (Ans.)

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