document.write( "Question 843034: $\"160+=+Pi+r+Sqrt%2836+%2B+r%5E2%29\"$
\n" ); document.write( "Solve for \"r\"\r
\n" ); document.write( "\n" ); document.write( "What I got up to:
\n" ); document.write( "160/Pi r = Sqrt(36 + r^2)
\n" ); document.write( "(160^2)/(Pi^2 r^2) = 36 + r^2
\n" ); document.write( "36= ((160^2)/(Pi^2 r^2)) - r^2 \n" ); document.write( "

Algebra.Com's Answer #507845 by josgarithmetic(39617) $\"\"$ $\"About$

You can put this solution on YOUR website!
Isolate r and any expressions with it onto one side; usually the simplest.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " $\"160+=+Pi+%2Ar%2A+Sqrt%2836+%2B+r%5E2%29\"$
\n" ); document.write( " $\"160%2Fpi=r%2Asqrt%2836%2Br%5E2%29\"$
\n" ); document.write( " $\"%28160%2Fpi%29%5E2=r%5E2%2836%2Br%5E2%29\"$
\n" ); document.write( " $\"36r%5E2%2Br%5E4=%28160%2Fpi%29%5E2\"$
\n" ); document.write( " $\"r%5E4%2B36r%5E2-%28160%2Fpi%29%5E2=0\"$ ----- this is in quadratic form, and you need to first solve for $\"r%5E2\"$ .\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Let $\"u=r%5E2\"$
\n" ); document.write( "Let

\n" ); document.write( " $\"u%5E2%2B36u-%28160%2Fpi%29%5E2\"$
\n" ); document.write( "-
\n" ); document.write( " $\"highlight%28u=%28-36%2B-+sqrt%281296%2B102400%2F%28pi%5E2%29%29%29%2F%282%29%29\"$ ----which part way to the answer.
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\n" ); document.write( "which you still want to try to simplify. \n" ); document.write( "

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