Posted by John on Monday, November 21, 2011 at 2:17am.
Try completing the square.
x(x-4) = x^2 -4x +4 -4
= (x-2)^2 - 4
The vertex is the lowest point of the parabolic curve. That is obviously where x = 2, where the first term is zero.
The value of y there is -4.
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