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September 17, 2014

September 17, 2014

Posted by **John** on Monday, November 21, 2011 at 2:17am.

y=x(x-4)

Calculator shows the vertex at (2,-4)

Can someone explain why? Thanks.

- Math (URGENT) -
**drwls**, Monday, November 21, 2011 at 2:23amTry 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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