Answer:
In the standard form of a quadratic equation, y = ax^2 + bx + c, changing the value of the h variable inside the parentheses of the x term, y = a(x - h)^2 + k, will shift the vertex of the parabola horizontally by h units.
If h is positive, the vertex will shift to the right, and if h is negative, the vertex will shift to the left. The amount of the shift is determined by the absolute value of h. For example, if h = 2, the vertex will shift to the right by 2 units.
Note that changing the value of h does not affect the shape of the parabola or its orientation. It only changes the position of the vertex.