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The important thing in this question is the letters. We want to group "like terms" together. This is what makes the expression simpler. I go about this by drawing a different shape around each lett...

Presentational features refer to the way a text is set out on a page, which can include for example the use of images and colour, logos, slogans, shapes, font style and size etc. You need to demonstrate to t...

Modulus , also known as absolute value , takes whatever's between the | straight brackets | and makes it positive. For example, |3|=3, and | - 3|=3. Interestingly, if you have any real number x , then | x |=...

First of all, don't worry - reading texts which were written four hundred years ago was never going to be easy! Even the most acclaimed scholars had that moment where they first opened their copy of The Merc...

First we must complete the square on both x and y. To complete a square we must take the number before the x and half it, for example nx we get n/2. We then write it as (x + n/2) 2 - (n/2) 2 . So for our que...