2 Answers
খ)
দেওয়া আছে,
x + 1/x = 4
বা, (x+1/x)2 = 16
বা, (x-1/x)2 + 4·x·1/x =16
বা, (x-1/x)2=12
বা, x - 1/x = 2√ 3 ...(i)
এখন, L.H.S.
=x3 - 1/x3
=(x-1/x)3 + 3·x·1/x(x-1/x)
= (2√3)3 + 3·2√3 [(i) থেকে]
=24√3 + 6√ 3
=30√ 3
=√( 2700)
=R.H.S.
[দেখানো হলো]
2673 views
Answered
ক.দেওয়া আছে, by²-(b²+1)y+b=0 বা,by²-b²y-y+b=0 বা,by(y-b)-1(y-b)=0 বা,(y-b)(by-1)=0 Either, y-b=0 বা ,y=b or, by-1=0 বা,by=1 বা,y=1\b
2673 views
Answered
Related Questions
Next steps
- Find a doctor for in-person or online consultation
- Browse medical tests patients often ask about
- Check medicine information (uses, dosage, brands in Bangladesh)
- More health Q&A on Bissoy