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For the curve f(x) = 2x^3 - 54x, find the stationary points and state the nature of these points

Firstly, find the values of x where f'(x) = 0 f'(x) = 6x 2 - 54 6x 2 - 54 = 0 6(x+3)(x-3) = 0 x = 3, y = -108 and x = -3, y = 108 Next, find the values of f''(x) at these points f''(x) = 12x When x = 3, f''(...
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Answered by Ruby W. • Maths tutor
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How should I structure an essay question asking me to evaluate a study?

A great acronym to remember when doing a longer essay question requiring you to evaluate a study is GRAVES. This stands for G eneralisability, R eliability, A pplicability, V alidity, E thics and S ubjectivi...
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Answered by AMY G. • Psychology tutor
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Why did people join the First Crusade?

The easiest way to split this question is by factor: economic/material gain, religious devotion, legal reasons, social reasons. In terms of historians, the more outdated view was that economic reasons were m...
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Answered by Lucy L. • History tutor
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What is the function of the Loop of Henle?

The loop of Henle is found in the medulla of the Kidney. Its primary function is reabsorption of NaCl and water. Through the counter-current multiplier effect, a hypertonic medulla is created allowing reabso...
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Answered by Asfandyar G. • Biology tutor
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What is the best way to structure an A level history exam essay question?

At A level it is best to keep the essay structure simple and clear for the examiner even though your analysis and thought processes should be more complex than GCSE level. Although each question will be slig...
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Answered by Lucy L. • History tutor
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