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What is the chain rule? when do I have to use it?

The chain rule is the technique used for differentiation when the equation you're trying to differentiate contains a function of a function. Consider ln(x). You should know this differentiates to 1/x. If how...
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Answered by Alex R. • Maths tutor
5905 Views

What is an advantage and disadvantage of oppertunity sampling?

Advantage: It is a quick and easy way of choosing participants for a study as it is based on convenience. Disadvantage: It may not be representative of the target population, potentially producing a sampling...
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Answered by Fae R. • Psychology tutor
21068 Views

How do you find the gradient of a line at a certain point when f(x) is in the form of a fraction, where both the numerator and denominator are functions of x?

Take the example f(x)=(2x^2+1)/(3x+5) , where we're finding the gradient at x=0. First, you need to differentiate f(x) to get f'(x). Because f(x) is a fraction where both the numerator and denominator are fu...
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Answered by Phoebe E. • Maths tutor
7045 Views

How do you find the turning points of a graph and how do you if the point is a maximum or a minimum?

Firstly you have to find the turning points of the graph. This is done by differentiating the equation of the line. Once you have found this first derivative, equate the equation to zero. Now solve the equat...
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Answered by Harry H. • Maths tutor
27749 Views

When do I need to use the subjunctive in French?

Although the subjunctive is becoming less common in informal spoken French today, it is still important for you to be able to recognise it and form it for use in written language. The subjunctive isn’t actua...
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Answered by Leah M. • French tutor
3748 Views