If the quadratic is written in the form y
= a(x – h)2 + k, then
the vertex is the point (h,
k). This makes sense, if you think about
it. The squared part is always positive (for a right-side-up parabola), unless it's zero. So you'll
always have that fixed value k,
and then you'll always adding something to it to make y
bigger, unless of course the squared part is zero. So the smallest y
can possibly be is y
= k,
and this smallest value will happen when the squared part, x
– h, equals zero. And the squared part
is zero when x – h =
0, or when
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