Question

Simplify this
(5+√5)(5-√5)​

Answer 1

Answer: 20

Step-by-step explanation:

Given, (5+√5)(5-√5)

we know that (a+b)(a-b)=a²-b²

here, in this case a=5 and b=√5

→(5)²-(√5)²

=25-5

=20

all the best for your exams

Answer 2

(5+√5)(5+√5)

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

Using

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

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

25+5+10√5

$30 + 10 \sqrt{5}$

Hope it's helpful to you