graceparker graceparker
  • 14-03-2017
  • Mathematics
contestada

Factor k2 - 81. I would love it if someone could help me

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Аноним Аноним
  • 14-03-2017
k2 - 81 = (k + 9)(k -9)

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charlottekrist
charlottekrist charlottekrist
  • 14-03-2017
1. Rewrite it in the form a^2-b^2, where a=k and b=9
k^2-9^2

2. Use difference of squares: a^2-b^2 = (a+b)(a-b)
(k+9)(k-9)
Answer Link

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