Question 398115
solve this equation.. 
x^6-9x^4-x^2+9=0 
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Notice that the coefficients sum to zero.
So x = 1 is a root.
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Notice that the polynomial is symmetric to 
the y-axis, so x = -1 is a root
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x= 3 and x = -3 are roots.
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There are 2 complex roots.  Use synthetic
division to find the quadratic factor and
the quadratic formula to find the roots.
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Cheers,
Stan H.