Question

(5-√11)(5+√11) is equal to

Answer 1

5-√11×5+√11

a-b×a+b=a²-b²


=5²-(√11)²
25-11

=14 Answer

Answer 2

Answer:-

$\bold{(5 - \sqrt{11} )(5 + \sqrt{11} )}$

Using the identity (a+b)(a-b)= a² - b²

$\bold{= (5) {}^{2} -( \sqrt{ 11}) {}^{2} }$

$\bold{ = 25 - 11}$

$\huge \bold{ = 14}$