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(ã5 + 5ã6)(ã5 - 5ã6)

is the answer -145 ???

  • Math -

    a^2 - b^2 = (a+b)(a-b)

    here we have
    a = sqrt 5
    b = 5 sqrt 6
    a^2 = 5
    b^2 = 25*6 = 150
    5 - 150 = -145
    so yes

  • Math -

    ty Sir

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