document.write( "Question 884403: the length of the rectangular garden is one more than twice its width. Its area is 80m^2. Express the length and width of the rectangular garden in terms of x. write the quadratic equation. find the lenght of the diagonal path across the garden.
\n" ); document.write( "
\n" ); document.write( "

Algebra.Com's Answer #534379 by josgarithmetic(39617)\"\" \"About 
You can put this solution on YOUR website!
x may be any one of three different quantities. I will use w for width and L for length. No use of x.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "The first sentence becomes \"L=1%2B2w\".
\n" ); document.write( "Area is \"wL=w%282w%2B1%29=80\".\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"2w%5E2%2Bw=80\"
\n" ); document.write( "\"2w%5E2%2B2w-80=0\"
\n" ); document.write( "-
\n" ); document.write( "Discriminant, \"2%5E2-4%2A2%2A%28-80%29=4%2B8%2A80=644\"
\n" ); document.write( "\"sqrt%28644%29=sqrt%284%2A161%29=sqrt%284%2A7%2A23%29=2sqrt%28161%29\"
\n" ); document.write( "-
\n" ); document.write( "\"w=%28-2%2B-+2sqrt%28161%29%29%2F4\"
\n" ); document.write( "You must use the plus square root in this case.
\n" ); document.write( "\"w=%28-2%2B2sqrt%28161%29%29%2F4\"
\n" ); document.write( "\"highlight%28w=%28-1%2Bsqrt%28161%29%29%2F2%29\"\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Use solution for w to find solution for L.
\n" ); document.write( "\"L=1%2B2w\"
\n" ); document.write( "\"L=1%2B2%28-1%2Bsqrt%28161%29%29%2F2\"
\n" ); document.write( "\"L=1%2B%28-1%2Bsqrt%28161%29%29\"
\n" ); document.write( "\"highlight%28L=sqrt%28161%29%29\"\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "You can go further and and use Pythagorean Theorem to get the diagonal:
\n" ); document.write( "Let r = the diagonal,
\n" ); document.write( "\"r%5E2=L%5E2%2Bw%5E2\"
\n" ); document.write( "\"r%5E2=161%2B%28%28-1%2Bsqrt%28161%29%29%2F2%29%5E2\"
\n" ); document.write( "\"r%5E2=161%2B%28%28sqrt%28161%29-1%29%2F2%29%5E2\"
\n" ); document.write( "\"r%5E2=161%2B%28sqrt%28161%29-1%29%5E2%2F4\"
\n" ); document.write( "\"r%5E2=%28644%2B%28sqrt%28161%29-1%29%5E2%29%2F4\"
\n" ); document.write( "\"%28644%2B161-2sqrt%28161%29%2B1%29%2F4\"\r
\n" ); document.write( "\n" ); document.write( "\"%28644%2B162-2sqrt%28161%29%29%2F4\"\r
\n" ); document.write( "\n" ); document.write( "\"%28806-2sqrt%28161%29%29%2F4\"\r
\n" ); document.write( "\n" ); document.write( "\"r%5E2=%28806-2sqrt%28161%29%29%2F4\"\r
\n" ); document.write( "\n" ); document.write( "\"r=sqrt%28%28806-2sqrt%28161%29%29%2F4%29\"\r
\n" ); document.write( "\n" ); document.write( "\"highlight%28r=sqrt%28806-2sqrt%28161%29%29%2F2%29\", the diagonal across the garden.
\n" ); document.write( "
\n" );