document.write( "Question 625171: You are given the coordinates of the vertex (7,8) and of a point (-4,-9) on a parabola. Find the equation of the parabola \n" ); document.write( "
Algebra.Com's Answer #393365 by nerdybill(7384)\"\" \"About 
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You are given the coordinates of the vertex (7,8) and of a point (-4,-9) on a parabola. Find the equation of the parabola
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\n" ); document.write( "Vertex form of parabola:
\n" ); document.write( "y= a(x-h)^2+k
\n" ); document.write( "plug provided info to find a:
\n" ); document.write( "8= a(7-(-4))^2+(-9)
\n" ); document.write( "8= a(7+4)^2+(-9)
\n" ); document.write( "8= a(11)^2+(-9)
\n" ); document.write( "17= a(11)^2
\n" ); document.write( "17= a(121)
\n" ); document.write( "17/121 = a
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\n" ); document.write( "Equation then is:
\n" ); document.write( "y= (17/121)(x-(-4))^2+(-9)
\n" ); document.write( "y= (17/121)(x+4)^2-9
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