Question

(5+√5) (5 -√5)
please answer it​

Answer 1

Step-by-step explanation:

Using the identity,

${(a}^{2} - {b)}^{2} = ( {a}^{2} + {b}^{2} )( {a}^{2} - {b}^{2} )$

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

$25 - 5$

$20$

Answer 2

Here, we can use the identity -

(a+b) (a-b) = a² - b²

replacing a and b with the given values -

(5+√5) (5-√5) = 5² - √5²

now let's solve it -

5² - √5²

5 square is 25

√5 square is 5

25 - 5

= 20

the answer is 20

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