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OpenStudy (anonymous):
Factorize x^4-11x^2-1
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jhonyy9 (jhonyy9):
sign x^2=y than you get y^2 -11y -1=0 y_1,_2=(11+/- sqrt(121+4))/2 =(11+/- sqrt125)/2 = (11+/- 5sqrt5)/2 x^2=(11+/- 5sqrt5)/2 x_1,_2=(11+/- 5sqrt5)/2 x_3,_4=-(11+/- 5sqrt5)/2
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