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OpenStudy (anonymous):
x^3 + 5x^2 + 3x + 15 = 0
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OpenStudy (zarkon):
\[x=-5,\pm\sqrt{3}i\]
hero (hero):
x^3+5x^2+3x+15 = 0 x^2(x+5)+3(x+5) = 0 (x+5)(x^2+3) = 0 x=-5, sqrt{3}i
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