izzyc789
izzyc789
23-11-2014
Mathematics
Answered
Factor completely
x^4 +8x^2 -9
Answer :
konrad509
konrad509
23-11-2014
[tex]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)[/tex]
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