document.write( "Question 896219: Find the solution of the Equation of 4x^4-5x^2-9=0 by using u- substitution method. \n" ); document.write( "
Algebra.Com's Answer #543360 by josgarithmetic(39630)\"\" \"About 
You can put this solution on YOUR website!
\"u=x%5E2\"\r
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\n" ); document.write( "\n" ); document.write( "\"4u%5E2-5u-9=0\"
\n" ); document.write( "\"%284u-9%29%28u%2B1%29=0\"\r
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\n" ); document.write( "\n" ); document.write( "EITHER \"4x%5E2-9=0\"
\n" ); document.write( "\"4x%5E2=9\"
\n" ); document.write( "\"x%5E2=9%2F4\"
\n" ); document.write( "\"highlight%28x=-3%2F2%29\" OR \"highlight%28x=3%2F2%29\"
\n" ); document.write( "OR
\n" ); document.write( "\"x%5E2%2B1=0\"
\n" ); document.write( "\"x%5E2=-1\"
\n" ); document.write( "\"x=-sqrt%28-1%29\" or \"x=sqrt%28-1%29\"
\n" ); document.write( "\"highlight%28x=-i%29\" or \"highlight%28x=i%29\"
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