document.write( "Question 946498: Need help on this problem...
\n" ); document.write( "16x^-4 - 65x^-2 +4 = 0\r
\n" ); document.write( "\n" ); document.write( "where u = x^-2
\n" ); document.write( "So far I've done...
\n" ); document.write( "16u^2 - 65u + 4 = 0
\n" ); document.write( "(16u - 1)(u - 4) = 0
\n" ); document.write( "u = 1/16 and u = 4
\n" ); document.write( "From there, I need help. \n" ); document.write( "
Algebra.Com's Answer #577412 by rothauserc(4718)\"\" \"About 
You can put this solution on YOUR website!
u = 1/16 and u = 4
\n" ); document.write( "picking up where you left off, note that u = x^-2
\n" ); document.write( "1) 1/x^2 = 1/16
\n" ); document.write( "x^2 = 16
\n" ); document.write( "x = 4 or-4
\n" ); document.write( "2) 1/x^2 = 4/1
\n" ); document.write( "4x^2 = 1
\n" ); document.write( "x^2 = 1/4
\n" ); document.write( "x = 1/2 or -1/2
\n" ); document.write( "now check the answers
\n" ); document.write( "16x^-4 - 65x^-2 +4 = 0
\n" ); document.write( "16/x^4 - 65/x^2 +4 = 0
\n" ); document.write( "now try x = 4
\n" ); document.write( "16/256 - 65/16 +4 = 0
\n" ); document.write( "0.0625 - 4.0625 +4 = 0
\n" ); document.write( "-4 +4 = 0
\n" ); document.write( "0 = 0
\n" ); document.write( "now try x = 1/2
\n" ); document.write( "16/(1/16) -65/(1/4) +4 = 0
\n" ); document.write( "-4 +4 = 0
\n" ); document.write( "0 = 0
\n" ); document.write( "the answers check\r
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