document.write( "Question 792016: 7. Find the vertex of the graph of the following equation: y = x^2 + 8x -12.\r
\n" ); document.write( "\n" ); document.write( "A. (4, -28)
\n" ); document.write( "B. (-4, -28)
\n" ); document.write( "C. (-4, 4)
\n" ); document.write( "D. (4, 4)
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Algebra.Com's Answer #479832 by waynest(281)\"\" \"About 
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x^2 + 8x - 12
\n" ); document.write( "x^2 + 8x + (8/2)^2 - (8/2)^2 -12
\n" ); document.write( "x^2 + 8x + 16 -16 - 12
\n" ); document.write( "(x + 4)^2 - 28\r
\n" ); document.write( "\n" ); document.write( "vertex is (-4, -28)
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