The difference quotient formula for a function f(x) is shown as [f(x+h) - f(x)] / h, with a graph of y = f(x) and two points on the curve.
Graph showing the difference quotient formula for a function f(x), with points (x, f(x)) and (x+h, f(x+h)) on the curve y = f(x), illustrating the slope of the secant line.
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