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Maths

posted by on .

*I'm a bit confused with this qn*
Expand and Simplify 3(3x-y)^2

  • Maths - ,

    3(3x-y)^2
    = 3(3x-y)(3x-y)= 3(9x^2 - 3xy - 3xy + y^2)
    = 27x^2 - 18xy + 3y^2

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