Question

If a-5-2 √5, then find a²​

Answer 1

Answer:

Hi friends

Step-by-step explanation:

a = 5-2√5

then

a²= (5-2√5)²

[using (a-b)² = a²-2ab+b²]

= 5² - (2)(5)(2√5) + (2√5)²

=25 - 20√5 + (4)(5)

= 25 - 20√5 + 20

=45 - 20√5

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Answer 2

Answer:

45-20√5

hope its right

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