document.write( "Question 637087: I need help finding the maximum y-value on the graph of y=f(x) when f(x)=-x^2+7x+3 \n" ); document.write( "
Algebra.Com's Answer #401417 by Tatiana_Stebko(1539)\"\" \"About 
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The maximum y is in the vertex of parabola \"y=-x%5E2%2B7x%2B3\"
\n" ); document.write( "x-coordinate of the vertex \"x=-7%2F%282%2A%28-1%29%29=3.5\"
\n" ); document.write( "y-coordinate of the vertex \"y=f%283.5%29=-%283.5%29%5E2%2B7%2A3.5%2B3=15.25\"
\n" ); document.write( "Answer: 15.25
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