document.write( "Question 1126203: Complete the general form equation of the parabola that passes through
\n" ); document.write( "(2,−21)with vertex at (−1,−3)\r
\n" ); document.write( "\n" ); document.write( "Enter the quadratic expression in general form,
\n" ); document.write( "ax^2+bx+c.\r
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Algebra.Com's Answer #742533 by MathTherapy(10552) $\"\"$ $\"About$

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\n" ); document.write( "Complete the general form equation of the parabola that passes through
\n" ); document.write( "(2,−21)with vertex at (−1,−3)\r
\n" ); document.write( "\n" ); document.write( "Enter the quadratic expression in general form,
\n" ); document.write( "ax^2+bx+c.
\n" ); document.write( "

Vertex from: 
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document.write( " ------- Substituting (2, - 21) for (x, y) and (- 1, - 3) for (h, k) 
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document.write( "- 21 = 9a - 3
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document.write( "- 21 + 3 = 9a
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document.write( "- 18 = 9a
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document.write( " ------- Substituting - 2 for a, and (- 1, - 3) for (h, k) 
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