document.write( "Question 1121490: Hello,
\n" ); document.write( "Given the following how would I solve for c?
\n" ); document.write( "The line function \"y=2x%2B4\" is tangent to the function \"y=x%5E2%2B8x%2Bc\"\r
\n" ); document.write( "\n" ); document.write( "(I know the answer is: 13 but not sure how to do it)\r
\n" ); document.write( "\n" ); document.write( "Thanks
\n" ); document.write( "

Algebra.Com's Answer #737380 by josgarithmetic(39617)\"\" \"About 
You can put this solution on YOUR website!
-------------------------------------------------------------------------
\n" ); document.write( "Given the following how would I solve for c?
\n" ); document.write( "The line function \"y=2x%2B4\" is tangent to the function \"y=x%5E2%2B8x%2Bc\"\r
\n" ); document.write( "\n" ); document.write( "(I know the answer is: 13 but not sure how to do it)
\n" ); document.write( "----------------------------------------------------------------------------\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Line touches parabolic function at one single point.
\n" ); document.write( "\"-%28x%5E2%2B8x%2Bc%29%2B%282x%2B4%29=0\"
\n" ); document.write( "-
\n" ); document.write( "\"-x%5E2-8x-c%2B2x%2B4=0\"
\n" ); document.write( "\"-x%5E2-6x%2B4-c=0\"
\n" ); document.write( "\"x%5E2%2B6x%2Bc-4=0\"
\n" ); document.write( "\"x%5E2%2B6x%2B%28c-4%29=0\"-------discriminant must be 0. ONE solution.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"6%5E2-4%2A1%2A%28c-4%29=0\"
\n" ); document.write( "\"36-4c%2B16=0\"
\n" ); document.write( "\"-4c=-36-16\"
\n" ); document.write( "\"4c=36%2B16\"
\n" ); document.write( "\"c=9%2B4\"
\n" ); document.write( "\"highlight%28c=13%29\"\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"graph%28400%2C400%2C-8%2C4%2C-8%2C4%2Cx%5E2%2B8x%2B13%2C2x%2B4%29\"
\n" ); document.write( "
\n" );