document.write( "Question 821654: a rectangle is 3cm longer than it is wide. the diagonal is 15 cm. find the dimensions of the rectangle. use quadratic formula \n" ); document.write( "
Algebra.Com's Answer #494305 by TimothyLamb(4379)\"\" \"About 
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\n" ); document.write( "x = y + 3
\n" ); document.write( "15 = sqrt( xx + yy )
\n" ); document.write( "225 = xx + yy
\n" ); document.write( "225 = (y + 3)(y + 3) + yy
\n" ); document.write( "225 = yy + 6y + 9 + yy
\n" ); document.write( "2yy + 6y - 216 = 0
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\n" ); document.write( "the above quadratic equation is in standard form, with a=2, b=6, and c=-216
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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 6 -216
\n" ); document.write( "into this solver: https://sooeet.com/math/quadratic-equation-solver.php
\n" ); document.write( "---
\n" ); document.write( "the two real roots (i.e. the two x-intercepts), of the quadratic are:
\n" ); document.write( "y = 9
\n" ); document.write( "y = -12
\n" ); document.write( "---
\n" ); document.write( "negative width doesn't make sense so use the positive root:
\n" ); document.write( "---
\n" ); document.write( "answer:
\n" ); document.write( "w= 9 cm
\n" ); document.write( "L= 12 cm
\n" ); document.write( "---
\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
\n" ); document.write( "---
\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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