document.write( "Question 884910: Select the x-coordinate of the vertex of the parabola defined by the function f(x)=-9x^2+7x+8 \n" ); document.write( "

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Select the x-coordinate of the vertex of the parabola defined by the function f(x)=-9x^2+7x+8
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document.write( "x-coordinate of the vertex is: , with: a being - 9, and b being 7
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document.write( " becomes 
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document.write( "x-coordinate of vertex:  \n" );
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