In this video we discover what the difference of two squares means and how to factorise these ‘special’ quadratics.
To factorise these quadratics, you need to know the square numbers. Any expression that has x-squared as the highest power of ‘x’ is a quadratic. When there is an x-squared, a square number and a minus sign but no middle x-term, we can use the difference of two squares to factorise them. Both the x-squared and the number have to be squares, and then they factorise into two brackets.
The brackets are identical except one bracket is plus and the other is minus.
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