Function Composition Quiz
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Questions and Answers

What is the function f(x) equal to?

x - 3 / x^2 - 1

What is the result of the composition of functions f(g(x)) equal to?

1/∛x - 3 / (1 / ∛x)^2 - 1

Flashcards

Function f(x)

A mathematical expression that represents a relationship between input values (x) and output values (y). It can be visualized as a graph.

Square Root Function

A function consisting of an expression under a square root sign. It is used to represent the relationship between the input and output of a function.

Cube Root Function

A function consisting of an expression under a cube root sign. It is used to represent the relationship between the input and output of a function.

Domain of a Function

The set of all possible input values (x) for which a function is defined.

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Composition of Functions

The result of performing one function on the output of another function. It can be written as (g∘f)(x).

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Order of Operations in (g∘f)(x)

The function f(x) is applied first, and its output is used as the input for function g(x)

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Simplification of Expressions

A process where the expression of a function, or a more complex expression, is rewritten in a simpler equivalent form.

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Expression for f(x)

The function that represents the relationship between the input value (x) and the output value (y) for the function f(x).

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Expression for g(x)

The function that represents the relationship between the input value (x) and the output value (y) for the function g(x).

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Substitution in (g∘f)(x)

The initial step in finding the composition (g∘f)(x) is to replace x in g(x) with the entire expression for f(x).

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Expression for f(x)

The expression (x-3)/√(x² - 1) represents the function f(x).

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Expression for g(x)

The expression 1/∛x represents the function g(x).

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Simplifying (g∘f)(x)

Simplify the expression g(f(x)) by combining the expressions for g(x) and f(x) and simplifying the result.

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Algebraic Manipulations

Intermediate algebraic steps are used to simplify the expression (g∘f)(x).

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Function Composition

Combining functions to create a new combined function. This new function's output depends both on the input and the results of the previous functions.

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Determining (g∘f)(x)

Finding the function that represents the composite function (g∘f)(x). This involves substituting and simplifying.

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Domain of (g∘f)(x)

The composite function (g∘f)(x) is defined for all values of x for which f(x) is defined and the output of f(x) is in the domain of g(x).

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Output of f(x)

The result of applying the function f(x) to an input value x.

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Study Notes

Function Composition

  • Function f(x) is defined as f(x) = (x-3)/(√(x²-1)), where x² ≠ 1
  • Function g(x) is defined as g(x) = 1/(∛x) , where x ≠ 0
  • The domain of f(x) is all real numbers except x = ±1
  • The domain of g(x) is all real numbers except x = 0
  • The composite function fog(x) is calculated as f(g(x))
  • fog(x) = (g(x) - 3) / √(g(x)² - 1)
  • Substituting g(x) into the expression for fog(x) gives (1/∛x - 3)/√((1/∛x)² - 1)
  • This simplifies to (1 - 3∛x)/√(1/∛x² - 1)
  • The composition gof(x) is calculated as g(f(x))
  • gof(x) = 1/∛f(x)
  • Substituting f(x) into the expression for gof(x) gives 1/∛((x-3)/(√(x²-1)))
  • Simplifying gives ∛(√(x²-1))/(x-3)

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Description

Test your understanding of function composition with this quiz on f(x) and g(x). You'll explore the calculation of fog(x) and gof(x), and see how to simplify these composite functions. Perfect for those studying advanced algebra concepts.

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