Question

not spam please give me answer​

Answer 1

Answer:

4-root 5

Step-by-step explanation:

Because the value of 4-√5 =(2+√1)(2-√2)

Answer 2

Step-by-step explanation:

Solution :

$\: \: (2 + \sqrt{1} )(2 - \sqrt{2} )$

$= > 2(2 - \sqrt{2} ) + \sqrt{1} (2 - \sqrt{2} )$

$= > 4 - 2 \sqrt{2} + 2 \sqrt{1} - 1 \sqrt{2}$

$= > 4 (- 3 + 2 \sqrt{2 + 1 + 2}$)

$= > 4( - 1 \sqrt{5}$)

$= > 4 - \sqrt{5} .$

Option 1 is correct