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aviral

· started a discussion

· 1 Months ago

2nd step?? (Question: 257202.0 )

explain

Question:

  .

Options:
A)

147

B)

122

C)

61

D)

31

Solution:

Ans: (c)

  

isha mishra

· commented

· 1 Months ago

Take the reciprocal of the expression given as a question x/(x2-5x+1)=1/3

That becomes, (x2-5x+1)/x = 3

Take x common from the numerator and solve....you will get x+ 1/x = 8

Now, apply the formula of (a+b)3 and put the values in the expression asked..i.e. x3 + 1/x3 / (x + 1/x)

x3 + 1/x3 = (x + 1/x)3 - 3(x)(1/x) (x+ 1/x)

x3 + 1/x3 = (8)3 - 3(8)

= 512 - 24

= 488


therefore, x3 + 1/x3/ (x + 1/x) = 488/8

= 61 answer



I tried to explain every detail, let me know if it helped.......
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