Question

(7+root5)× (7-root5)​

Answer 1

Answer: 44

Step-by-step explanation:

(7 + √5)(7 - √5)

=> 7² - (√5)²              [since (a + b)(a - b) = a² - b²]

=> 49 - 5

=> 44

Answer 2

Answer:

(7+$\sqrt{5}$)(7-$\sqrt{5}$)

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

= $7^{2}$-$(\sqrt{5}) ^{2}$

=49-5

=44