Search over 10,000 free study notes

For a linear sequence use DNA! This is a formula that can be used to work out the nth term. It is officially written as Dn+alets take an example: 3, 7, 11, 15, 19, 23The "D" stands for the diffe...

Dividing fractions looks hard but is a lot easier than you think! Let's take two fractions: 1/4 and 3/8. If you are asked to divide 1/4 by 3/8 the easiest way to do this is to flip the 3/8 round to give 8...

First we substitute one x or y into the other equation. The easiest one to put in in this case would be the y in equation (2). So putting the y into (1) you get x^2 + (2x-3)^2=41. Then we expand out the b...

When presented with a simultaneous equation, you need to find out the values of the letters (commonly x and y). You might be given two equations such as: a) 2x + 4y = 6, and b) -4x - 3y = 3. The first thi...

The question is asking for the range of x values that satisfies the inequality. First rearrange the equation to form a quadratic: x² – x – 6 < 0. Factorise the quadratic to find x-intercepts...