document.write( "Question 434506: Please help me solve this problem. A parabolic arch has an equation of y= -300x^2 + 300x=0. Find the maximum height of the arch in feet. \n" ); document.write( "
Algebra.Com's Answer #301007 by Alan3354(69443)\"\" \"About 
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Please help me solve this problem. A parabolic arch has an equation of y= -300x^2 + 300x=0. Find the maximum height of the arch in feet.
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\n" ); document.write( "-300(x^2 - x) = 0
\n" ); document.write( "x^2 - x = 0
\n" ); document.write( "Complete the square
\n" ); document.write( "(x^2 - x + 0.25) = 0.25
\n" ); document.write( "(x - 0.5)^2 = 0.25
\n" ); document.write( "Line of symmetry is x = 0.5
\n" ); document.write( "Vertex is (0.5,f(0.5))
\n" ); document.write( "f(0.5) = -300*0.25 + 300*0.5 = 75
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