Question

How do you multiply 5-√2*5+√2?

Answer 1

Answer:

$(5 - \sqrt{2})(5 +\sqrt{2})$

according to the identity,

$(x - y)(x + y) = {x}^{2} - {y}^{2}$

$= {5}^{2} - ({ \sqrt{2} })^{2}$

$= 25 - 2$

$= 23$