document.write( "Question 320155: y^-2-3y^-1+4=0 \n" ); document.write( "

Algebra.Com's Answer #229917 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
Use a substitution, let $\"u=y%5E%28-1%29\"$ .
\n" ); document.write( " $\"u%5E2=y%5E%28-2%29\"$
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\n" ); document.write( " $\"y%5E%28-2%29-3y%5E%28-1%29%2B4=0\"$
\n" ); document.write( " $\"u%5E2-3u%2B4=0\"$
\n" ); document.write( " $\"%28u-3%29%28u-1%29=0\"$
\n" ); document.write( "Two solutions:
\n" ); document.write( " $\"u-3=0\"$
\n" ); document.write( " $\"u=3\"$
\n" ); document.write( " $\"y%5E%28-1%29=3\"$
\n" ); document.write( " $\"highlight%28y=1%2F3%29\"$
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\n" ); document.write( " $\"u-1=0\"$
\n" ); document.write( " $\"u=1\"$
\n" ); document.write( " $\"y%5E%28-1%29=1\"$
\n" ); document.write( " $\"highlight%28y=1%29\"$ \n" ); document.write( "

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