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Consider f(x)=x/(x^2+1). Find the derivative f'(x)

To answer this question we need to decide which differentiation rule to use . The quotient rule looks like the obvious choice, so lets try that. If f(x)=u(x)/v(x) (being careful that v(x) is not zero anywher...
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Answered by Jack H. • Maths tutor
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How do I find the roots of a quadratic equation?

A quadratic equation is one that contains an x^2 term that has a non 0 coefficient, There are three basic methods for solving a quadratic equation; factorising, completing the square, and the quadratic formu...
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Answered by MacGregor C. • Maths tutor
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What is meant by the doctrine of Parliamentary sovereignty (supremacy)?

Parliamentary sovereignty is the idea, originating in this form in the United Kingdom legal system, that ‘Any Act of Parliament, or any part of an Act of Parliament, which makes a new law, repeals or modifie...
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Answered by Matthew O. • Law tutor
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How do I answer a question which requires source analysis?

The most common question in history A-level source papers is “With reference to these sources and your understanding of the historical context, assess the value of these sources to an historian”. The most im...
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Answered by Elin S. • History tutor
6097 Views

Describe and explain the adaptions of the human alveoli in making gas exchange efficient

Gas exchange can be made efficient in three main ways: shortening the diffusion distance, increasing the diffusion speed and increasing the surface area of the diffusion surface. The alveoli in the human lun...
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Answered by Eloise G. • Biology tutor
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