MATH 1023 Chapter : Section 3 1R2R

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15 Mar 2019
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Definition: a relation is a correspondence between two sets a and b such that each element of set a corresponds to one or more elements of set b. Definition: a function is a relation such that for each element in the domain, there is exactly one corresponding element in the range. Example 1: determine whether each relation represents a function. To determine if an equation defines y as a function of x, solve for y. Example 2: determine whether the equation defines y as a function of x: 3x + y = 1, x + y2 = 1. Notation: y = f(x) means apply the rule f to the number x . Example 3: given f(x) = x2 x + 1. Definition: the difference quotient of a function y = f(x) at a number x in the domain of f is defined as the expression f(x+h) f(x) h.

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