Here's the question you clicked on:
stupidinmath
DOES CHANGING THE VALUE OF H AFFECT THE SHAPE OF A PARABOLA?
WHAT IS H? (Or: what is H? There is no need for shouting).
From the vertex :(h,k) and, im not shouting:)
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It seems that changing the value of h has all kinds of change effects on the shape of the parabola, if you look at @UnkleRhaukus' drawings ;) or has it?
The value of h does NOT change the shape of the parabola, it merely translates it left and right.
That's what @UnkleRhaukus tried to make clear...
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if k is + it moves it up, if k is - it moves it down if h is + it moves it left, if h is - it moves it right if a is negative, you will have a reflection about the x axis
Actually, precal, is h is + it moves right, but in the equation you write x - h. The sign of h doesn't change. Just sayin'