Please give me step by step explanation/answer
Simplify the following radical expression
(7+sqrt 13)(7-sqrt 13)
since (a+b)(a-b) = a^2-b^2
(7+√13)(7-√13) = 49-13 = 36
Simplify the following radical expression
(7+sqrt 13)(7-sqrt 13)
(7+√13)(7-√13) = 49-13 = 36