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27 February, 12:59

Solve the equation (3x-7y) ^2=

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  1. 27 February, 16:07
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    (3x - 7y) (3x - 7y)

    = 3x (3x-7y) - 7 (3x - 7y)

    = 9x² - 21xy - 21xy + 49y²

    = 9x² - 42xy + 49y²
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