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Published byJerome Montgomery Modified over 4 years ago

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Operations on Functions Lesson 3.5

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Sums and Differences of Functions If f(x) = 3x + 7 and g(x) = x 2 – 5 then, h(x) = f(x) + g(x) = 3x + 7 + (x 2 – 5) So, h(x) = x 2 + 3x – 2 Now, if h(x) = f(x) – g(x), then 3x + 7 – (x 2 – 5) = -x 2 + 3x + 12

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Example

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Products and Quotients If f(x) = 3x 2 + 7 and g(x) = 4, then f(x)g(x) = 4(3x 2 + 7) = 12x 2 + 28

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Composition of Functions If f and g are functions, then the composite function of f and g is (g◦f)(x) = g(f(x)) The expression g ◦ f is read g circle f or f followed by g. The functions are applied right to left.

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Examples

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Domain of g ◦ f Let f and g be functions. The domain of g ◦ f is the set of all real numbers x such that –x is in the domain of f –f(x) is in the domain of g

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Example

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Writing a Function as a Composite

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Applications

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