Question

simplify
(5+√5) (5-√5)​

Answer 1

Answer:

20

Step-by-step explanation:

(5+√5)(5-√5)= 5²-5√5+5√5-5

= 25-5

= 20

Answer 2

Formula used :

${a}^{2} + {b}^{2} + 2ab$

Now:

${5}^{2} + { \sqrt{5} }^{2} + 2 \times 5 \times \sqrt{5}$

$= 25 + 5 + 10 \sqrt{5}$

$= 30 + 10 \sqrt{5}$

$= 10(3 + \sqrt{5} )$

hope it helps:)