document.write( "Question 316554: Given the polynomial 3x^2-6x-18 what is the vertex of it's graph \n" ); document.write( "

Algebra.Com's Answer #226454 by Fombitz(32388) $\"\"$ $\"About$

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Complete the square to convert to vertex form,
\n" ); document.write( " $\"y=a%28x-h%29%5E2%2Bk\"$
\n" ); document.write( "where (h,k) is the vertex.
\n" ); document.write( " $\"y=3x%5E2-6x-18\"$
\n" ); document.write( " $\"y=3%28x%5E2-2x%29-18\"$
\n" ); document.write( " $\"y=3%28x%5E2-2x%2B1%29-18-3\"$
\n" ); document.write( " $\"y=3%28x-1%29%5E2-21\"$
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\n" ); document.write( "(1,-21) is the vertex.
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