anaguzman
anaguzman anaguzman
  • 21-02-2017
  • Mathematics
contestada

someone please help me!!!!!

someone please help me class=

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ULKa
ULKa ULKa
  • 21-02-2017
(3a-7)^2= (3a)^2 - 2*3a*7 + 7^2= 9a^2- 42a+ 49
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