Question

multiply
(x+13)(x-13)

Answer 1

x^2 - 169

Answer 2

This is a difference of squares


\[\Large (x+13)(x-13) = x^2-169\]

Answer 3

These two are conjugates of each other (meaning same numbers in the parenthesis but different signs) so the middle terms cancel out.. so all you have to do is square the first term and square the second term and when you do that you get..\[x^2 - 169\]