Question

(2+√5)•(2-√5)хелп помогитее

Answer 1

Ответ:9

Объяснение:

Умножение многочленов:

4-2✔️5+2✔️5+5=

Подобные сокращаются

4+5=9

Answer 2

Sure, I'd be happy to help you with this mathematical expression!

To simplify the expression (2 + √5) • (2 - √5), we can use the difference of squares formula, which states that (a + b) • (a - b) = a^2 - b^2.

In this case, a = 2 and b = √5. So, the expression becomes:

(2 + √5) • (2 - √5) = 2^2 - (√5)^2

Now, let's simplify further:

2^2 = 4 (√5)^2 = 5

Therefore:

(2 + √5) • (2 - √5) = 4 - 5 = -1

So, the simplified value of the expression is -1.