document.write( "Question 981674: what is the solution to
\n" ); document.write( "x^4+5x^2-36=0
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Algebra.Com's Answer #602656 by macston(5194)\"\" \"About 
You can put this solution on YOUR website!
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\n" ); document.write( "Let y=x^2
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\n" ); document.write( "x^4+5x^2-36=0 Substitute for x^2.
\n" ); document.write( "y^2+5y-36=0
\n" ); document.write( "(y+9)(y-4)=0
\n" ); document.write( "(y+9=0) OR (y-4=0)
\n" ); document.write( "(y=-9) OR (y=4) Substitute for y
\n" ); document.write( "(x^2=-9) OR (x^2=4)
\n" ); document.write( "(x=+ or - 3i) OR (x= + or - 2)
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