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How do you multiply out two brackets?

Let us use the example of (x + 3)(x + 5) The main thing we have to remember is to multiply every term in the first bracket by every term in the second bracket. An easy way to make sure we've done this is to ...
ET
Answered by Elliot T. • Maths tutor
7086 Views

What is dimensional analysis and how is it used?

When one is faced with a problem requiring derivation of an equation, they might be asked to use dimensional analysis . This is a concept that involves analyzing the units of known quantities (usually it is ...
CI
Answered by Christina I. • Physics tutor
2819 Views

What is ATP and why do we need it?

ATP is short for adenosine triphosphate, and it can be thought of as the energy 'currency' in our cells. It has a similar structure to that of an RNA nucleotide, as it is comprised of a nitrogenous base (ade...
TD
17478 Views

How come x^2 = 25 has 2 solutions but x=root(25) only has one? Aren't they the same thing?

(This is something that I didnt fully understand for quite a while at school.) So when we are solving x 2 =25, in order to get x "on it's own" we square root both sides. However the definition of r...
DJ
Answered by Dylan J. • Maths tutor
8955 Views

What is you opinion when it comes to what people think about global warming? Answer in Spanish.

El cambio climático es algo muy importante. Es de vital importancia que los tratemos como tal, ya que de no ser así, podríamos sufrir fatales consecuencias. No todo el mundo piensa que el cambio climático es...
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Answered by Christian R. • Spanish tutor
1849 Views