document.write( "Question 655010: The area of a rectangle is given by A = x2 – 2x + 30. Find the value of x if the total area of the rectangle is equal to 45 square units. \n" ); document.write( "

Algebra.Com's Answer #408906 by nerdybill(7384) $\"\"$ $\"About$

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The area of a rectangle is given by A = x2 – 2x + 30. Find the value of x if the total area of the rectangle is equal to 45 square units.
\n" ); document.write( ".
\n" ); document.write( " $\"A+=+x%5E2+%96+2x+%2B+30\"$
\n" ); document.write( "since they give A as 45, substitute it in:
\n" ); document.write( " $\"45+=+x%5E2+%96+2x+%2B+30\"$
\n" ); document.write( " $\"0+=+x%5E2+%96+2x+%2B+15\"$
\n" ); document.write( "factoring:
\n" ); document.write( " $\"0+=+%28x%2B3%29%28x-5%29\"$
\n" ); document.write( "x = {-3, 5}
\n" ); document.write( "throw out the negative solution (extraneous) leaving:
\n" ); document.write( "x = 5 \n" ); document.write( "

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