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Here we have an equation involving absolute values. As a general rule |a| = +a and |a| = -a. We can apply that to our RHS. In the first case we get that 3x + 4 = 3x - 11, however after we subtract 3x from bo...

Here z is a complex number, and therefore, z = a + b i. Thus, our equation becomes (a + b i)^2 = i. Expanding the brackets we get a^2 + 2 a b i + (b^2) (i^2) = i. Since i is the square root of -1, i^2 = the ...

A tritone is an interval between two notes in a diatonic scale that is exactly half an octave. It's characterised by the interval of a diminished fifth, or augmented fourth. As an example of a tritone, take ...

At A level you're usually expected to make reference to some levels of literary criticism in your writing- literary criticism is when concepts and ideas belonging to particular schools of thought and academi...

A really useful structure to use when writing an answer to a question is the PEEL model- Point, Evidence, Explanation, Link. Say for instance you're writing an answer to a question on how Steinbeck presents ...