document.write( "Question 296384: FIND THE VERTEX THE LINE OF SYMMETRY THE MAXIMUM OR MINIMUM VALUES OF THE QUADRATIC FUNCTION F(X)=-X^2+10X+5
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Algebra.Com's Answer #213568 by josmiceli(19441) $\"\"$ $\"About$

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$\"f%28x%29+=+-x%5E2+%2B+10x+%2B+5\"$
\n" ); document.write( "When the sign of the squared term is minus, the
\n" ); document.write( "curve has a max and not a min.
\n" ); document.write( "The x co-ordinate of the max is always at
\n" ); document.write( " $\"-b%2F2a\"$
\n" ); document.write( " $\"-b+=+-10\"$
\n" ); document.write( " $\"2a+=+-2\"$
\n" ); document.write( " $\"-10%2F%28-2%29+=+5\"$
\n" ); document.write( "Now I need $\"f%285%29\"$
\n" ); document.write( " $\"f%285%29+=+-5%5E2+%2B+10%2A5+%2B+5\"$
\n" ); document.write( " $\"f%285%29+=+-25+%2B+50+%2B+5\"$
\n" ); document.write( " $\"f%285%29+=+30\"$ maximum
\n" ); document.write( "The line of symmetry is simply the x-value $\"x+=+5\"$
\n" ); document.write( "Here's a plot:
\n" ); document.write( " $\"+graph%28+400%2C+400%2C+-5%2C+12%2C+-5%2C+35%2C+-x%5E2+%2B+10x+%2B+5%29+\"$
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