document.write( "Question 310368: Find Complex Roots:
\n" ); document.write( "x^4 -11x^2 +28 =0 \n" ); document.write( "

Algebra.Com's Answer #221948 by richwmiller(17219) $\"\"$ $\"About$

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let y^2=x^4 and y=x^2
\n" ); document.write( "y^2-11y+28=0
\n" ); document.write( "(y-4)*(y-7)=0
\n" ); document.write( "y=4 and y=7
\n" ); document.write( "x^2=4
\n" ); document.write( "x=+-2
\n" ); document.write( "x^2=7
\n" ); document.write( "x=+-sqrt(7)
\n" ); document.write( "There are no complex roots.
\n" ); document.write( " \n" ); document.write( "

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