Keerthana
Posted on

If x1x=5x-frac{1}{x}=5, then x2+1x2x^{2}+frac{1}{x^{2}} is :

a

27

b

25

c

5

d

23

Answer : Option A
Explanation :

x1x=5x-frac{1}{x}=5

दोनों पक्षों का वर्ग करने पर, x2+1x22=25x^{2}+frac{1}{x^{2}}-2=25

x2+1x2=27Rightarrow x^{2}+frac{1}{x^{2}}=27

Rate This:
NaN / 5 - 1 votes
Profile photo for Dasaradhan Gajendra