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How do I expand double brackets?

Use the moon method.

E.g. (x+1)(x+2) 

  1. multiply x with x

  2. multiply x with 2

  3. mutiply 1 with x

  4. multiply 1 with 2

<...
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Answered by Sulayman H. Maths tutor
9326 Views

A body of mass 2kg is travelling in a straight line along the x-axis. It collides with a second body of mass 3kg which is moving at -2m/s. The two bodies move off together at 3m/s. What is the initial velocity of the first body?

2u-32=53=15, 2u=15+6. Therefore, u=10.5m/s. This is a standard type of question, it is simply about conservation of momentum. Momentum (p) is equal to massvelocity. Initially, the first body ...

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Answered by Caroline L. Physics tutor
2834 Views

Why is ethylamine a stronger base than phenylamine?

A base is a proton acceptor. 

Amines work as bases due to the electronegativity of the nitrogen atom. The lone pair in the nitrogen atom is filled in a 2p(z) orbital, in phenylamine, the p orbital ...

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Answered by Adhib M. Chemistry tutor
8898 Views

'Charles I's intransigence was the ultimate cause of the regicide'. Assess the validity of this view.

To answer this question, it is important to consider three different points of view - that which agrees, that which disagrees and that which offers an alternative perspective. It would be ideal to offer a...

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Answered by Miriam D. History tutor
3440 Views

How do I structure my personal statement?

When writing your personal statement it is important to be concise and keep everything as relevant as possible. Begin by demonstrating your interest in the subject you are applying for and why you are int...

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2317 Views

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