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Aptitude | Algebra | Question 2

Last Updated : 31 Aug, 2021
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The value of x+1/2x is given as 2, then find the value of 8x3+1/x3

(A)

40/3

(B)

20/7

(C)

28

(D)

40


Answer: (D)

Explanation:

x3 + 1/8x3 + 3.x.1/2x(x + 1/2x) = (x+1/2x)3

x3 + 1/8x3 + 3 = 23

x3 + 1/8x3 = 5

8x3 + 1/x3 = 5.8 = 40
 


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