In this video the instructor shows how to factor the difference of squares using a formula. The formula to find the difference of squares can only be applied if you have two perfect squares. The formula is (a * a  b * b) = (a  b) * (a + b). That is the difference of squares of two numbers is the product of sum of two numbers and difference of two numbers. So when you need to find the difference of squares of two numbers substitute the values in the above formula to directly solve for the factors. Now the instructor goes on and solves a couple of problems based on the explained concept. This video shows how to factor the difference of squares using a formula.
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