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OpenStudy (anonymous):
solve. 15x^4-28x^2+5=0
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OpenStudy (anonymous):
(x^2 - 25)(x^2 - 3) (x + 5)(x - 5)(x^2 - 3) x + 5 = 0, x= -5 x-5 =0, x=5 x^2 - 3 = 0, x^2 = 3, x = +/- √3
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