How To Understand Completing The Square
|Education : Maths|
It is not immediately obvious what this term means, or when to use it.
The answer is: it is used in algebra to solve a quadratic equation. It is used when the equation will not factorise (be expressed as a pair of brackets).
To do this, you simply express the expression as a square, plus another term.
Here's an example:
x^2 + 10x
(x + 5)^2 - 25
How to work it out? To find the number, follow this easy step:
Divide the coefficient of x by 2 then square, and take this away outside the equation.
Questions about gcse maths: