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VCE 12 Methods 2023

5.02 The chain rule

Interactive practice questions

Given that $y=u^3$y=u3 and $u=2x+3$u=2x+3, define $y$y in terms of $x$x. Leave your answer in factored form.

Easy
< 1min

Consider the function $f\left(x\right)=\left(5x^3-4x^2+3x-5\right)^7$f(x)=(5x34x2+3x5)7.

Redefine the function as composite functions $f\left(u\right)$f(u) and $u\left(x\right)$u(x), where $u\left(x\right)$u(x) is a polynomial.

Easy
1min

Consider the function $f\left(x\right)=\sqrt[4]{2x^2+2x+3}$f(x)=42x2+2x+3.

Redefine the function as composite functions $u\left(x\right)$u(x) and $f\left(u\right)$f(u), where $u\left(x\right)$u(x) is a polynomial.

Easy
< 1min

Consider the function $f\left(x\right)=\frac{1}{\left(4x^2-3x+5\right)^3}$f(x)=1(4x23x+5)3.

Redefine the function as composite functions $f\left(u\right)$f(u) and $u\left(x\right)$u(x), where $u\left(x\right)$u(x) is a polynomial.

Easy
< 1min
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Outcomes

U34.AoS3.3

derivatives of f(x) +/- g(x), f(x) x g(x), f(x)/g(x) and (𝑓 ∘ 𝑔)(𝑥) where f and g are polynomial functions, exponential, circular, logarithmic or power functions and transformations or simple combinations of these functions

U34.AoS3.12

the sum, difference, chain, product and quotient rules for differentiation

U34.AoS3.17

apply the product, chain and quotient rules for differentiation to simple combinations of functions by hand

U34.AoS3.16

find derivatives of polynomial functions and power functions, functions of the form f(ax+b) where f is x^n, sine, cosine; tangent, e^x, or log x base e and simple linear combinations of these, using pattern recognition, or by hand

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