Question

If a=5-2√5 ,then find a^2​

Answer 1

Answer:

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Step-by-step explanation:

given a = 5 - 2√5. then, (a)^2 = (5-2√5)^2. [ (a-b)^2 = a^2 + b^2 - 2ab ] => (a)^2 = (5)^2 + (2√5)^2 - 2(5)(2√5) = 25 + 20 - 20√5. = 45 - 20√5.

Answer 2

Answer:

a

Step-by-step explanation:

a = 5-2√5

a^2 = (5-2√5)^2

a^2 = 5^2 + 2√5^2 - 2(5)(2√5)

a^2 = 25 + 20 - 20√5

a^2 = 45 - 20√5