document.write( "Question 354221: z-3/z+5= 2/7 \n" ); document.write( "

Algebra.Com's Answer #253176 by checkley77(12844) $\"\"$ $\"About$

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z-3/z+5= 2/7
\n" ); document.write( "z-3/z=2/7-5
\n" ); document.write( "(z*z-3)/z=(2-5*7)/7
\n" ); document.write( "(z^2-3)/z=(2-35)/7
\n" ); document.write( "(z^2-3)/z=-33/7 cross multiply.
\n" ); document.write( "7(z^2-3)=-33z
\n" ); document.write( "7z^2-21+33z=0
\n" ); document.write( "7z^2-33z-21=0
\n" ); document.write( "Ans. using: $\"z+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+\"$ IS (5.28 & -.568).
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\n" ); document.write( "Unless you mean:
\n" ); document.write( "(z-3)/(z+5)= 2/7 Then:
\n" ); document.write( "7(z-3)=2(z+5)
\n" ); document.write( "7z-21=2z+10
\n" ); document.write( "7z-2z=10+21
\n" ); document.write( "5z=31
\n" ); document.write( "z=31/5
\n" ); document.write( "z=6.2 ans. \n" ); document.write( "

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