Question

answer these question quickly please​

Answer 1

Step-by-step explanation:

(Root 5 + root 2)^2

=( root 5 )^2 + (root 2)^2 + 2*root5 * root2

5*2*2 root 10

10* 2 root 10

20 root 10

(root 5 + root 2) (root 5 - root 2)

(a+b )(a - b) = a^2 - b^2

= (root 5)^2 - (root 2)^2

5-2

=3

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Answer 2

Your answer:

1. (a+b)² = a² + 2ab + b²

a = √5, b= √2

$(\sqrt{5} )^2+2\sqrt{2\times5}+(\sqrt{2})^2$ = 5 + 2$\sqrt{10}$ + 2 = 7+ 2$\sqrt{10}$

2. (a+b)(a-b) = a² - b²

a = √5, b= √2

5 - 2 = 3

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