document.write( "Question 257655: a Parabola has a vertex (-1,5) and contains the point (2,-4). Write an equation of the parabola in the form y-k = a(x-h)^2 \n" ); document.write( "
Algebra.Com's Answer #189557 by nerdybill(7384)\"\" \"About 
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a Parabola has a vertex (-1,5) and contains the point (2,-4). Write an equation of the parabola in the form y-k = a(x-h)^2
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\n" ); document.write( "y-k = a(x-h)^2
\n" ); document.write( "The (h,k) is the vertex
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\n" ); document.write( "Plug in what was given in the problem:
\n" ); document.write( "y-k = a(x-h)^2
\n" ); document.write( "-4-5 = a(2-(-1))^2
\n" ); document.write( "-9 = a(2+1)^2
\n" ); document.write( "-9 = a(3)^2
\n" ); document.write( "-9 = a(9)
\n" ); document.write( "-1 = a
\n" ); document.write( ".
\n" ); document.write( "So, we can rewrite:
\n" ); document.write( "y-k = a(x-h)^2
\n" ); document.write( "as
\n" ); document.write( "y-5 = -1(x-(-1))^2
\n" ); document.write( "y-5 = -(x+1)^2 (this is what they're looking for)\r
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