Composite and Inverse Functions (VCE SSCE Mathematical Methods): Quizzes

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Composite and Inverse Functions
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What does the notation g∘f(x)g \circ f(x) mean?

Apply ff first, then apply gg

For g∘fg \circ f to be defined, what must be true?

Range of ff must be in domain of gg

Which composition gives h(x)=ex2h(x) = e^{x^2}?

f(x)=x2f(x) = x^2 and g(x)=exg(x) = e^x

What property must a function have to possess an inverse?

It must be one-to-one

How are the domain and range related for ff and f−1f^{-1}?

Domain of f−1f^{-1} equals range of ff

A function ff is strictly increasing if:

Whenever a>ba > b, we have f(a)>f(b)f(a) > f(b)

A function ff is strictly decreasing if:

Whenever a>ba > b, we have f(a)<f(b)f(a) < f(b)

Are strictly increasing functions always one-to-one?

Yes, they are always one-to-one

If ff is strictly increasing, what can we say about f−1f^{-1}?

f−1f^{-1} is strictly increasing

What is the inverse of g(x)=1xg(x) = \frac{1}{\sqrt{x}} for x∈R+x \in \mathbb{R}^+?

g−1(x)=1x2g^{-1}(x) = \frac{1}{x^2}

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