x = √3+√2 হলে x2+1/x2 এর মান কত?

A 1

B 2

C 10

D 12

Solution

Correct Answer: Option C

x = √3+√2
∴1/x = 1/(√3+√2)
=(√3-√2)/{(√3+√2)(√3-√2)
= √3-√2

∴ x + 1/x = √3+√2+√3-√2 = 2√3
x2+1/x2 = (x + 1/x)2 - 2.x.1/x = (2√3)2 - 2
= 4×3 - 2 = 10

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