KONSTANTINOS T. A Level Maths tutor, A Level Physics tutor, A Level G...

KONSTANTINOS T.

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Degree: Civil, Environmental and Geomatic Engineering (Masters) - University College London University

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About me

I am a Master Civil Engineering Student at UCL with a first class (honours) degree. I have achived to get A* at my Maths and Physics Exams.

Subjects offered

SubjectLevelMy prices
Maths A Level £20 /hr
Physics A Level £20 /hr
Maths GCSE £18 /hr
Physics GCSE £18 /hr

Qualifications

QualificationLevelGrade
Mining EngineeringMasters Degree69
Civil Engineering Masters Degree72
IELTSHigher78
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Questions KONSTANTINOS has answered

What is the second derivative used for?

First of all, "second derivative", d2y/dx2, is what you get when you differentiate the first derivative (dy/dx). The second derivative can be used as an easier way of determining the stationary points of a curve. A stationary point on a curve can be a maximum point, a minimum point or a poin...

First of all, "second derivative", d2y/dx2, is what you get when you differentiate the first derivative (dy/dx).

The second derivative can be used as an easier way of determining the stationary points of a curve.

A stationary point on a curve can be a maximum point, a minimum point or a point of inflection. Those occur when dy/dx = 0. Once you have established where there is a stationary point, the type of stationary point (maximum, minimum or point of inflection) can be determined using the second derivative.

Thus,

If d2y/dx2 (second derivative of y in terms of x)  is positive, then it is a minimum point

If d2y/dxis negative, then it is a maximum point

If d2y/dx2 is zero, then it could be a maximum, minimum or point of inflection.

If d2y/dxis 0, you must test the values of dy/dx (first derivative) either side of the stationary point, as before in the stationary points section.

If dy/dx is possitive before and negative after the stationary point then the last is a maximum. 

If dy/dx is negative before and possitive after the stationary point then the last is a minimum. 

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8 months ago

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