Question 1182015


r(x) = x^4  -  8x^2  -  9 }}}


{{{ x^4 -9x^2 +x^2 -9}}}

{{{ x^2(x^-9) +1(x^2-9)}}}

{{{ (x^2-9)(x^2+1)}}}

{{{(x+3)(x-3)(x^2+1)}}}


(x^2+1) not (x+1)(x-1)








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