document.write( "Question 160536: 21000=12000(1+r/4)^36 solve for r \n" ); document.write( "

Algebra.Com's Answer #118427 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"21000=12000%281%2Br%2F4%29%5E36\"$
\n" ); document.write( " $\"21%2F12=%281%2Br%2F4%29%5E36\"$
\n" ); document.write( "Take the 36th root of both sides(when we do this we'll have both positive and negative solution).
\n" ); document.write( "We'll add that at the end.
\n" ); document.write( " $\"%2821%2F12%29%5E%281%2F36%29=%281%2Br%2F4%29\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"%2821%2F12%29%5E%281%2F36%29-1=r%2F4\"$
\n" ); document.write( " $\"r=4%28%2821%2F12%29%5E%281%2F36%29-1%29\"$ and
\n" ); document.write( " $\"r=-4%28%2821%2F12%29%5E%281%2F36%29-1%29\"$ and
\n" ); document.write( "or approximately r=0.0627, -0.0627
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\n" ); document.write( "Just in case, your equation looks like this,
\n" ); document.write( " $\"21000=12000%28%281%2Br%29%2F4%29%5E36\"$
\n" ); document.write( " $\"21%2F12=%28%281%2Br%29%2F4%29%5E36\"$
\n" ); document.write( " $\"%2821%2F12%29%5E%281%2F36%29=%281%2Br%29%2F4\"$
\n" ); document.write( " $\"4%2821%2F12%29%5E%281%2F36%29=1%2Br\"$
\n" ); document.write( " $\"r=4%28%2821%2F12%29%5E%281%2F36%29%29-1\"$
\n" ); document.write( "Then approximately,
\n" ); document.write( "r=3.063,-3.063 \n" ); document.write( "

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