Composition of Functions

Front

What is the composition of functions?

Back

The composition of functions is a way to combine two functions, where the output of one function becomes the input of another. It is denoted as (f ∘ g)(x) = f(g(x)).

Tags

CCSS.HSF-BF.A.1C

Front

If h(x) = 3x - 1 and f(x) = x^2 + 2, what is (h ∘ f)(x)?

Back

(h ∘ f)(x) = h(f(x)) = h(x^2 + 2) = 3(x^2 + 2) - 1 = 3x^2 + 6 - 1 = 3x^2 + 5.

Tags

CCSS.HSF-BF.A.1C

Front

If f(x) = √(x + 5) - 1 and g(x) = 4x - 3, find (f ∘ g)(x).

Back

(f ∘ g)(x) = f(g(x)) = f(4x - 3) = √((4x - 3) + 5) - 1 = √(4x + 2) - 1.

Tags

CCSS.HSF-BF.A.1C

Front

What is the notation for function composition?

Back

The notation for function composition is (f ∘ g)(x), which means 'f of g of x'.

Tags

CCSS.HSF-BF.A.1C

Front

If f(x) = 3x - 1 and g(x) = x^2 + 2, what is (g ∘ f)(x)?

Back

(g ∘ f)(x) = g(f(x)) = g(3x - 1) = (3x - 1)^2 + 2 = 9x^2 - 6x + 1 + 2 = 9x^2 - 6x + 3.

Tags

CCSS.HSF-BF.A.1C

Front

What is the result of f(x - 2) if f(x) = 2x^2 - 5x + 18?

Back

f(x - 2) = 2(x - 2)^2 - 5(x - 2) + 18 = 2(x^2 - 4x + 4) - 5x + 10 + 18 = 2x^2 - 8x + 8 - 5x + 28 = 2x^2 - 13x + 18.

Tags

CCSS.HSF.IF.A.2

Front

If w(x) = -3x + 9 and g(x) = 5x - 7, find (w ∘ g)(x).

Back

(w ∘ g)(x) = w(g(x)) = w(5x - 7) = -3(5x - 7) + 9 = -15x + 21 + 9 = -15x + 30.

Tags

CCSS.HSF-BF.A.1C

Front

What is the domain of a composition of functions?

Back

The domain of (f ∘ g)(x) is the set of all x such that g(x) is in the domain of f.

Tags

CCSS.HSF-BF.A.1B

Front

What is the range of a composition of functions?

Back

The range of (f ∘ g)(x) is the set of all possible outputs of f(g(x)).

Tags

CCSS.HSF-BF.A.1B

Front

If f(x) = x^2 and g(x) = 2x + 1, what is (f ∘ g)(x)?

Back

(f ∘ g)(x) = f(g(x)) = f(2x + 1) = (2x + 1)^2 = 4x^2 + 4x + 1.

Tags

CCSS.HSF-BF.A.1C