deb9386 deb9386
  • 22-05-2018
  • Mathematics
contestada

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

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tramserran
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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