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Use completing the square to find the minimum of y = x^2 - 4x + 8

Remember completing the square gives a result of the form (x+q) 2 + p where q and p are numbers Also q is always half of the x term, which in this case is -4, as such q = -2 Substituting this in, we get (x-2...
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Answered by Sol D. • Maths tutor
3842 Views

What is an atom?

Atoms are the smallest particle of matter that cannot be divided and have a nucleus which contains protons and neutrons with electrons surrounding it in energy levels.
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Answered by Shazna B. • Chemistry tutor
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What are the 4 chambers of the heart?

The 4 chambers of the heart are: Right atrium,Right ventricle,Left atrium and left ventricle.
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How do I construct the perfect tense in German? I don't understand what an auxiliary verb is.

The perfect tense can be constructed as follows: Subject + auxiliary verb + past participle. For example, 'ich habe gelesen' (I have read).
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Answered by Susannah H. • German tutor
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How might you estimate the population size for a species of bird?

As birds are a motile organism, we would use the mark-release-recapture method. First, capture a sample of individuals (possibly through mist netting), mark them (e.g. a wing tag or leg ring) and release. Th...
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Answered by Kieran L. • Biology tutor
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