document.write( "Question 570796: a rancher has 180 ft of fencing to enclose two adjacent rectangular corrals. A river forms one side of the corrals. Suppose the width of each corral is x ft. Express the total area of the two corrals as a function of x. Find the domain of the function. \n" ); document.write( "
Algebra.Com's Answer #367862 by ankor@dixie-net.com(22740)\"\" \"About 
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a rancher has 180 ft of fencing to enclose two adjacent rectangular corrals.
\n" ); document.write( " A river forms one side of the corrals. Suppose the width of each corral is x ft.
\n" ); document.write( "Express the total area of the two corrals as a function of x. Find the domain of the function.
\n" ); document.write( ":
\n" ); document.write( "That would be 3 widths and 1 length, therefore
\n" ); document.write( "L + 3x = 180
\n" ); document.write( "L = (180-3x)
\n" ); document.write( ":
\n" ); document.write( "A = L * X
\n" ); document.write( "replace L with (180-3x)
\n" ); document.write( "A = x(180-3x)
\n" ); document.write( "A = -3x^2 + 180x; total area as a function of x
\n" ); document.write( ":
\n" ); document.write( "Graph y - -3x^2+180x
\n" ); document.write( "\"+graph%28+300%2C+200%2C+-20%2C+80%2C+-1000%2C+3000%2C+-3x%5E2%2B180x+%29+\"
\n" ); document.write( "You can see max area when x=30 ft and domain is 0 to 60 \n" ); document.write( "
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