document.write( "Question 975803: The length of a rectangle is 7 more than the width. The area is 800 square centimeters. Find the length and width of the rectangle. Using the applications of quadratic equations \n" ); document.write( "

Algebra.Com's Answer #597451 by Boreal(15235) $\"\"$ $\"About$

You can put this solution on YOUR website!
W=x
\n" ); document.write( "L=x+7\r
\n" ); document.write( "\n" ); document.write( "x(x+7)=700 sq cm\r
\n" ); document.write( "\n" ); document.write( "x^2+7x-700=0\r
\n" ); document.write( "\n" ); document.write( "x=(1/2) * -7 +/- sqrt (49+2800)\r
\n" ); document.write( "\n" ); document.write( "sqrt(2849)=53.376\r
\n" ); document.write( "\n" ); document.write( "x=(1/2) [-7+53.376]; negative root not significant\r
\n" ); document.write( "\n" ); document.write( " $\"graph%28300%2C300%2C-10%2C30%2C-100%2C800%2Cx%5E2%2B7x-700%29\"$
\n" ); document.write( "x=0.5* 46.376= 23.188 cm
\n" ); document.write( "x+7=30.188 cm\r
\n" ); document.write( "\n" ); document.write( "product of two is 700 sq cm\r
\n" ); document.write( "\n" ); document.write( " $\"graph%28300%2C300%2C-50%2C50%2C-1000%2C1000%2Cx%5E2%2B7x-700%29\"$ \n" ); document.write( "

\n" );