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( "

Algebra.Com's Answer #534776 by josgarithmetic(39617) $\"\"$ $\"About$

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Complete the Square to put the function into standard form and then read the x value for vertex from the function.\r
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\n" ); document.write( "\n" ); document.write( " $\"f%28x%29=-9%28x%5E2-%287%2F9%29x%29%2B8\"$
\n" ); document.write( " $\"-9%28x%5E2-%287%2F9%29x%2B%287%2F%282%2A9%29%29%5E2%29%2B8%2B9%287%2F%282%2A9%29%29%5E2\"$
\n" ); document.write( " $\"-9%28x-7%2F18%29%5E2%2B8%2B9%287%2F%282%2A9%29%29%5E2\"$ \r
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\n" ); document.write( "\n" ); document.write( "Although the arithmetic simplifying the constant term is not finished, the x value for the vertex is $\"highlight%28x=7%2F18%29\"$ .\r
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\n" ); document.write( "\n" ); document.write( "Also study this lesson:
\n" ); document.write( "Also shows standard form: Completing the Square to Solve General Quadratic Equation \n" ); document.write( "

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