![]() The graphs are shifted vertically (by the difference of respective C values). Similarly, the difference in y-values of h(x) and g(x) is 1 ( = 2 – 1 ). The difference in y-values of g(x) and f(x) is 2 ( = 1 – (-1) ). The graphs below show this shift using the following functions: If C is positive, the graph shifts up, and if C is negative, it shifts down. The value of C increases (or decreases, if C is negative) the value of the function. Therefore y-intercept is always equal to (0, C). So its y-coordinate is easy to calculate: The y-intercept is a point where the graph hits the y-axis. ![]() The axis of symmetry passes through x = -1 and is parallel to the y-axis. ![]() Using the formula above, you can calculate x and y values of the vertex as:
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