document.write( "Question 325821: Find the vertex of the parabola formed by the following quadratic function: y = -x2 – 4x – 9 \n" ); document.write( "

Algebra.Com's Answer #233236 by solver91311(24713) $\"\"$ $\"About$

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-coordinate of the vertex of a parabola in standard form:

is given by:\r
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\n" ); document.write( "\n" ); document.write( "The

-coordinate of the vertex of a parabola in standard form:

is given by:\r
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