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How do I expand and simplify linear equations?

Let's take the example: 3( x + 2) + 2( x - 1) Start with the first part: 3( x + 2) We have to multiply what is outside of the bracket with the individual things inside the bracket sparately and add them toge...
AO
Answered by Alexis O. • Maths tutor
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What is the difference between SN1 and SN2 reactions, and how do you determine via which mechanism the reaction will proceed?

This is the sort of question you are likely to stumble across in an IB HL Paper 2 examination. It would probably carry a few more marks and thus require a longer answer, but that is reason to panic!First of ...
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Answered by James G. • Chemistry tutor
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What is Mass Spectrometry?

Mass spectrometry is a technique we use to analyse and determine the structure of compound . Generally, it works by injecting your compound into an ionisation chamber , where it breaks up into smaller fragme...
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Answered by Sinead B. • Chemistry tutor
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Show that the integral of tan(x) is ln|sec(x)| + C where C is a constant.

First, recall that tan(x) can be rewritten in terms of sine and cosine. tan(x) = sin(x)/cos(x) The rephrasing of our question suggests that we should try the substitution rule of integration. We should subst...
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Answered by Anja S. • Maths tutor
209884 Views

What else is the definite article (le/la/les) used for in French?

In most instances where English uses the definite article, French does too. However, it has some special uses in French, which I shall explain below. 1) Must be used with all abstract nouns (nouns referring ...
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Answered by James H. • French tutor
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