Question

(5-square root of 11)(5+square root of 11)​

Answer 1

(5-√11)(5+√11)

(5)^2-(√11)^2

25-11

14

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Answer 2

Answer:

$= (5 - \sqrt{11} )(5 + \sqrt{11} ) \\ = (5) {}^{2} - ( \sqrt{11} ) {}^{2} \\ = 25 - 11 \\ = 14$

using the identity a^2-b^2=(a+b)(a-b)