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OpenStudy (anonymous):
solve. 15x^4-28x^2+5=0
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OpenStudy (anonymous):
x=1/sqrt(5) x=-1/sqrt(5) and x=sqrt(5/3) and x=-sqrt(5/3)
OpenStudy (anonymous):
(5x^2-1)(3x^2-5) \[x= \pm \sqrt{1/5}and \pm \sqrt{5/3}\]
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