deb9386 deb9386

22-05-2018
Mathematics

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

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tramserran tramserran

22-05-2018

(3x - 7y)(3x - 7y)
= 3x(3x-7y) - 7(3x - 7y)
= 9x² - 21xy -21xy + 49y²
= 9x² - 42xy + 49y²

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