Question

Drag the expressions to the correct functions. Not all expressions will be used.
Consider the functions fand g.
= 4x² + 1
g(x) =
Perform the function compositions:
x² – 3

Answers

  1. The function composition exists an operation ” ∘ ” that brings two functions f and g, and has a function h = g ∘ f such that h(x) = g(f(x)).
    Let the functions be f(x) = 4x² + 1 and g(x) = x² – 3
    The correct answer is (f o g)(x) = 4x⁴ – 96x + 37 and
    (g o f)(x) = 16x⁴ + 8x² – 2.

    What is composition function?

    The function composition exists an operation ” ∘ ” that brings two functions f and g, and has a function h = g ∘ f such that h(x) = g(f(x)). In this operation, the function g exists used for the outcome of applying the function f to x.
    Given:
    f(x) = 4x² + 1 and g(x) = x² – 3
    a) (f o g)(x) = f[g(x)]
    f[g(x)] = 4(x² – 3)² + 1
    substitute the value of g(x) in the above equation, and we get
        = 4(x⁴ – 24x + 9) + 1
    simplifying the above equation
        = 4x⁴ – 96x + 36 + 1
        = 4x⁴ – 96x + 37
    (f o g)(x) = 4x⁴ – 96x + 37
    b) (g o f)(x) = g[f(x)]
    substitute the value of g(x) in the above equation, and we get
    g[f(x)] = (4x² + 1)²- 3
          = 16x⁴ + 8x² + 1 – 3
    simplifying the above equation
          = 16x⁴ + 8x² – 2
    (g o f)(x) = 16x⁴ + 8x² – 2.
    Therefore, the correct answer is (f o g)(x) = 4x⁴ – 96x + 37 and
    (g o f)(x) = 16x⁴ + 8x² – 2.
    To learn more about the function refer to:
    #SPJ9

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