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1. x =√ 3 +√2 হলে x2+1/x2 এর মান কত?
- A. 1
- B. 1
- C. 1
- D. 1
Answer: Option C
Explanation:
দেওয়া আছে,
x=√3+√2
˙..1/x=1/√3+√2
=√3−√2/(√3+√2)√3−√2
=√3−√2/3−2
=√3−√2/1
=√3−√2
˙..x+1/x=√3+√2+√3−√2
=2√3
x2+1/x2
=(x+1/x)2−2x1/x
=(2√3)2−2
=10
x=√3+√2
˙..1/x=1/√3+√2
=√3−√2/(√3+√2)√3−√2
=√3−√2/3−2
=√3−√2/1
=√3−√2
˙..x+1/x=√3+√2+√3−√2
=2√3
x2+1/x2
=(x+1/x)2−2x1/x
=(2√3)2−2
=10
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