document.write( "Question 63780: y=-2x^2-16x-35
\n" ); document.write( "find the vertex
\n" ); document.write( "find the equation of the axis of symetry
\n" ); document.write( "find the coordinates of the focus
\n" ); document.write( "find the equation of the directrix
\n" ); document.write( "find the length of the latus rectum
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Algebra.Com's Answer #44482 by venugopalramana(3286)\"\" \"About 
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SEE THE FOLLOWING EXAMPLE AND TRY.IF STILL IN DIFFICULTY PLEASE COME BACK
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\n" ); document.write( "(2) What is the (a)directrix and the (b)focus of the parabola y = x^2 - 5x + 4?
\n" ); document.write( "Y = [X^2-2*X*(5/2)+(5/2)^2]-(5/2)^2+4
\n" ); document.write( "(X-2.5)^2 = (Y+2.25)
\n" ); document.write( "COMPARING WITH STD. EQN. OF PARABOLA
\n" ); document.write( "(X-H)^2 = 4A(Y-K)
\n" ); document.write( "4A=1......A=1/4=0.25
\n" ); document.write( "VERTEX = (H,K)......= (2.5,-2.25)
\n" ); document.write( "AXIS = X-H=0.......X-2.5=0
\n" ); document.write( "FOCUS = [H,K+A].....[2.5,-2.25+0.25]=(2.5,-2)
\n" ); document.write( "DIRECTRIX = Y-K+A=0......Y+2.25+0.25=0.......Y+2.5=0
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