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Evalutade the following by using identity …

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Evalutade the following by using identity 1

    • Posted by Beena Sharma 6 years, 3 months ago

    CBSE > Class 08 > Mathematics
    • 1 answers

    Sia ? 6 years, 3 months ago

    We have,
    (399)2 = (400 - 1)2
    = (400)2 + (1)2 - 2 {tex}\times{/tex} 400 {tex}\times{/tex} 1  [{tex}\because{/tex} (a - b)2 = a2 + b2 - 2ab]
    = 160000 + 1 - 800
    = 160001 - 800
    = 159201

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