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To understand surds we have to understand powers and there uses. So to start we should look at powers such as what is 2² , 3², and 5². This shows us going up but then we l...

The athlete begins to sweat, as exercising releases energy from the body in the form of heat, so the water evaporating from the surface of the skin results in the body cooling down.

Bien que je sois arrivé à la maison ce soir-là, je ne voulais pas entrer.

Firstly you want to factorise this expression. You have n², so you know you want to multiple n by itself. Next, you want to think carefully about what two numbers add to get -...

You want to end up an equation that show what a is in terms of p. To make things simpler, we want to get rid of the fraction on the right by multiplying both sides by (4 - a). If we do this we end up with...