document.write( "Question 822519: The length of a rectangle is twice its width.
\n" ); document.write( "If the area of the rectangle is 200cm ^2 , find its perimeter. \n" ); document.write( "
Algebra.Com's Answer #494915 by TimothyLamb(4379)\"\" \"About 
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\n" ); document.write( "L = 2w
\n" ); document.write( "Lw = 200
\n" ); document.write( "---
\n" ); document.write( "Lw = 200
\n" ); document.write( "2ww = 200
\n" ); document.write( "2ww - 200 = 0
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\n" ); document.write( "the above quadratic equation is in standard form, with a=2, b=0, and c=-200
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\n" ); document.write( "to solve the quadratic equation, by using the quadratic formula, copy and paste this:
\n" ); document.write( "2 0 -200
\n" ); document.write( "into this solver: https://sooeet.com/math/quadratic-equation-solver.php
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\n" ); document.write( "this quadratic has two real roots (the x-intercepts), which are:
\n" ); document.write( "w = 10
\n" ); document.write( "w = -10
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\n" ); document.write( "negative width doesn't make sense for this problem, so use the positive root
\n" ); document.write( "---
\n" ); document.write( "w = 10 cm
\n" ); document.write( "L = 20 cm
\n" ); document.write( "perimeter = 60 cm
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\n" ); document.write( "Solve and graph linear equations:
\n" ); document.write( "https://sooeet.com/math/linear-equation-solver.php
\n" ); document.write( "---
\n" ); document.write( "Solve quadratic equations, quadratic formula:
\n" ); document.write( "https://sooeet.com/math/quadratic-formula-solver.php
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\n" ); document.write( "Solve systems of linear equations up to 6-equations 6-variables:
\n" ); document.write( "https://sooeet.com/math/system-of-linear-equations-solver.php \n" ); document.write( "
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