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A.

-875/248

B.

-694/315

C.

-765/262

D.

-995/343

Correct option is D

Given:  ​
​7a−7a+4=07a - \frac{7}{a} +4 = 0 
value to find ; a3−1a3+1a^3 - \frac{1}{a^3}+1 
Formula Used: ​
​(a−1a)3=a3−(1a)3−3(a−1a)\left(a-\frac{1}{a}\right)^3 = a^3 - \left( \frac{1}{a}\right)^3-3\left(a-\frac{1}{a}\right)​​
Solution:
​

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