document.write( "Question 766442: I need to know the y-value of f(x)=-x^2+10x+10.Thank you \n" ); document.write( "
Algebra.Com's Answer #466896 by josgarithmetic(39627)\"\" \"About 
You can put this solution on YOUR website!
This is a function having infinite number of y-values. It has a maximum y value.\r
\n" ); document.write( "\n" ); document.write( "If you will add and subtract \"%2810%2F2%29%5E2=25\", you can transform into
\n" ); document.write( "\"f%28x%29=-%28x-5%29%5E2-35\"\r
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\n" ); document.write( "\n" ); document.write( "The vertex is at the maximum, so all y values are LESS than or equal to (5,-35).\r
\n" ); document.write( "\n" ); document.write( "\"highlight%28f%28x%29%3C=-35%29\"\r
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\n" ); document.write( "Done using Completing the Square.
\n" ); document.write( "Do you need to see the steps?
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