Differentiating Where n is a Negative Integer (VCE SSCE Mathematical Methods): Quizzes

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Differentiating Where n is a Negative Integer
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What does the notation R∖{0}\mathbb{R} \setminus \{0\} mean?

All real numbers except zero

What is the derivative of f(x)=x−4f(x) = x^{-4}?

f′(x)=−4x−5f'(x) = -4x^{-5}

How do you rewrite 1x2\frac{1}{x^2} using negative powers?

x−2x^{-2}

When nn is negative in f(x)=xnf(x) = x^n, what is the domain?

R∖{0}\mathbb{R} \setminus \{0\}

What is the derivative of a constant cc?

00

Find f′(x)f'(x) for f(x)=x−1+2f(x) = x^{-1} + 2.

f′(x)=−x−2f'(x) = -x^{-2}

What is f′(1)f'(1) if f(x)=x2+x−1f(x) = x^2 + x^{-1}?

11

Find the derivative of 2x−32x^{-3}.

−6x−4-6x^{-4}

Why is x4x^4 positive for all x≠0x \neq 0?

Any number to an even power is positive

Why is f′(x)=−3x4f'(x) = \frac{-3}{x^4} always negative for x≠0x \neq 0?

x4x^4 is positive, so −3x4<0\frac{-3}{x^4} < 0

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