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The curve y = 2x^3 -ax^2 +8x+2 passes through the point B where x = 4. Given that B is a stationary point of the curve, find the value of the constant a.

y=2x 3 - ax 2 + 8x +2. If we are told that B is the stationary point of the curve, then it is at that point where the gradient of the curve is equal to 0. In order to find the gradient of the curve at this p...
FM
Answered by Frazer M. • Maths tutor
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Explain how volcanic eruptions occur at destructive plate margins (4 marks usually).

Oceanic crusts are forced beneath the continental crust at a subduction zone because they are denser. Heat produced by friction turns the sinking oceanic plate into magma. This then tries to reach the surfac...
GE
18650 Views

How does the structure of the grana optimise its function?

The grana is made up of stacked thylakoid membranes which give a larger surface area upon which the photosystems and chlorophyll can trap light energy. The space within the membrane stack allows proton movem...
SM
Answered by Sophie M. • Biology tutor
5815 Views

Name two advantages and disadvantages of hormonal contraception?

One advantages of hormonal contraception are that, when used properly i.e. taken on time and regularly, they are more effective than physical barrier contraceptives such as condoms or diaphragms. However the...
SM
Answered by Sophie M. • Biology tutor
4687 Views

Describe two examples of the increased power of the state during World War One (4)

'Describe' questions are looking for historical, contextual, knowledge - tailored specifically to the question.For example the examiner will have hundreds of papers to mark and they are looking for specific ...
JH
Answered by James H. • History tutor
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