Further Applications of Differentiation (HSC SSCE Mathematics Advanced): Quizzes

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Further Applications of Differentiation
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What is ddx(log⁡ex)\frac{d}{dx}(\log_e x)?

1x\frac{1}{x}

What is the gradient of the tangent to y=log⁡exy = \log_e x at (e,1)(e, 1)?

1e\frac{1}{e}

If a tangent has gradient 1e\frac{1}{e}, what is the gradient of the normal?

−e-e

What is the domain of y=xlog⁡exy = x \log_e x?

x>0x > 0

Where does y=xlog⁡exy = x \log_e x cross the x-axis?

x=1x = 1

What is dydx\frac{dy}{dx} for y=xlog⁡exy = x \log_e x?

log⁡ex+1\log_e x + 1

Where is the stationary point of y=xlog⁡exy = x \log_e x?

x=e−1x = e^{-1}

What is the nature of the stationary point at x=e−1x = e^{-1} for y=xlog⁡exy = x \log_e x?

Minimum

What can be said about concavity of y=xlog⁡exy = x \log_e x for x>0x > 0?

Always concave up

What is lim⁡x→0+xlog⁡ex\lim_{x \to 0^+} x \log_e x?

00

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