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(4-x)^-1/2 = (4 (1 - x/4))^-1/2 = 1/2 (1 - x/4)^-1/2 = 1/2 ( 1 + x/8 + 3x²/128 + ...) = 1/2 + x/16 + 3x²/256 + ...Therefore the first three ter...

The first step is reinstate the context whereby the interviewer asks the eyewitness to mentally and physically imagine and recall the crime scene including environmental context of crime scene e.g. smell,...

To calculate the pH of a solution/compound, we can use the equation: pH = - log₁₀[H+]Within the sodium hydroxide solution, you would observe Na + and OH - ions so in order to find the concentra...

Exam essay questions test your ability to produce a coherent argument using knowledge and ideas learned during the year. It is often tempting to try to include everything you've learned, but the best answ...

In my experience practice makes perfect and the best way to do this is to immerse yourself with as much past papers as you can do. Maths is maths so don't be afraid to check other exam boards for their pa...