Question

If a =2+√5/2 find the value of a2 +1/a2

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Answer 1

Answer:4.9

Explanation:

if a=2√5/2 it means it is equal to 2.23

So (2.23×2)/2+1/(2.23×2)

it means a2+1/a2=(2.23×2)/2+1/(2.23×2)= 2.23+0.22=4.9