Question

(3-sq root 11) (3+ sq root 11)
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Answer 1

$= > (3 + \sqrt{11} )(3 - \sqrt{11} ) \\ \\ = > {3}^{2} - {( \sqrt{11)} }^{2} \\ \\ = > 9 - 11 \\ \\ = > - 2$

Answer 2

$\huge \bold \red{heya}$

(3-√11)(3+√11)

We have an identity,

(a+b)(a-b)=a²-b²

=(3)²-(√11)²

=9-11

=-2