What Is a Difference of Squares?
What Is a Difference of Squares?
A difference of squares is square number (a number multiplied by itself) subtracted from another square number.
A Real Example of a Difference of Squares
It is easier to understand a difference of squares with an example.
In this example,

3^{2} = 3 × 3 = 9 (3 squared).

2^{2} = 2 × 2 = 4 (2 squared).
The two numbers are square numbers. They are squares.
Two numbers are being subtracted from each other. It is a difference of squares.
A Difference of Squares in General
In general, we can use symbols instead of numbers:
a and b are both integers (whole numbers).
How to Factor a Difference of Squares
A difference of squares can be factored into two brackets: