document.write( "Question 813509: the length of a poster is 10cm longer than its width. if the area of the poster is 1200cm square, what is the width of the poster. \n" ); document.write( "
Algebra.Com's Answer #489734 by TimothyLamb(4379)\"\" \"About 
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L = w + 10
\n" ); document.write( "Lw = 1200
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\n" ); document.write( "Lw = 1200
\n" ); document.write( "(w + 10)w = 1200
\n" ); document.write( "ww + 10w - 1200 = 0
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\n" ); document.write( "the above quadratic equation is in standard form, with a=1, b=10, and c=-1200
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\n" ); document.write( "to solve the quadratic equation, plug this:
\n" ); document.write( "1 10 -1200
\n" ); document.write( "into this: https://sooeet.com/math/quadratic-equation-solver.php
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\n" ); document.write( "Answer 1:
\n" ); document.write( "the quadratic equation has two real roots:
\n" ); document.write( "root1 = 30
\n" ); document.write( "root2 = -40
\n" ); document.write( "---
\n" ); document.write( "the negative root doesn't make sense for a length, so use the positive root.
\n" ); document.write( "w = 30 cm
\n" ); document.write( "L = 40 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( "Convert fractions, decimals, and percents:
\n" ); document.write( "https://sooeet.com/math/fraction-decimal-percent.php
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\n" ); document.write( "Calculate and graph the linear regression of any data set:
\n" ); document.write( "https://sooeet.com/math/linear-regression.php \n" ); document.write( "
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