AS/A2 Pure 2 Pure 3

P1 Topic 2: Algebra
Identities - equating coefficients 2
The display below shows how this is done. You can change the quadratic function and then see the process, step by step.

Summary It is important to understand the difference between variable and constant. A, B, C and D are constants, whereas x is a variable. It is true that at the start you do not know the values of any of them, but A, B, C and D will have fixed values that you can work out. x does not have a fixed value, so you cannot find it! The identity sign º means that the left hand side (LHS) and right hand side (RHS) of the identity are equal for all values of x. This page uses HotEqn.