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izzyc789 izzyc789
  • 23-11-2014
  • Mathematics
Answered

Factor completely

x^4 +8x^2 -9

Verified Answer :

konrad509
konrad509 konrad509
  • 23-11-2014

\(x^4 +8x^2 -9=\\ x^4-x^2+9x^2-9=\\ x^2(x^2-1)+9(x^2-1)=\\ (x^2+9)(x^2-1)=\\ (x^2+9)(x-1)(x+1)\)

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