Refer to Example. Geometrically, what does the expression 2x + h + 6 represent on the graph of f ? What do you think it represents if h = 0?
EXAMPLE Simplifying a difference quotient
Simplify the difference quotient
using the function f(x) = x2 + 6x − 4.
SOLUTION
The following type of function is one of the most basic in algebra.
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