Question

(5+√5)(5-√5) is equal to

Answer 1

Answer:

20

Explanation:

Hi dear,

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Here's the explanation -

$(5 + \sqrt{5} )(5 - \sqrt{5} ) \\ < (x + y) (x - y) = ({x}^{2} - {y}^{2}) > \\ = > x = 5 \: y = \sqrt{5} \\ = > ( {5}^{2} - ( \sqrt{5})^{2} ) \\ = > 25 - 5 = 20 \\ answer = 20$

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