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Expand each of the following using suitable identities (-2x+5y-3z)²

    • Posted by Shruti Gupta 4 years, 2 months ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Gaurav Seth 4 years, 2 months ago

    We know that

    (a+b+c)² = a² + b² + c² + 2(ab + bc + ca)

    So,

    (-2x + 5y - 3z)²

    = (-2x)² + (5y)² + (-3z)² + 2 [ (-2x)*5y + 5y*(-3z) + (-3z)*(-2x) ]

    = 4x² + 25y² + 9z² + 2 [ (-10xy) + (-15yz) + 6xz ]

    = 4x² + 25y² + 9z² - 20xy - 30yz + 12xz

    1Thank You

    ANSWER
    http://mycbseguide.com/examin8/

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