document.write( "Question 584915: How many real and complex roots does the plynomial f(x)=x^3+9x have? \n" ); document.write( "
Algebra.Com's Answer #372966 by jim_thompson5910(35256)\"\" \"About 
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f(x)=x^3+9x\r
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\n" ); document.write( "\n" ); document.write( "0=x^3+9x\r
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\n" ); document.write( "\n" ); document.write( "x^3+9x=0\r
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\n" ); document.write( "\n" ); document.write( "x(x^2+9)=0\r
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\n" ); document.write( "\n" ); document.write( "x=0 or x^2+9=0\r
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\n" ); document.write( "\n" ); document.write( "x=0, x=3i or x=-3i\r
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\n" ); document.write( "\n" ); document.write( "So there is one real root and two complex roots.\r
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