InterviewSolution
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InterviewSolution
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यदि `4a 4/a+3=0` है तो `a^(3)-1/(a^(3))+3=?`A. `7/16`B. `3/16`C. `21/64`D. `21/16` |
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Answer» Correct Answer - C Given `4a4/a+3=0` Find : `a^(3)-1/(a^(3)+3)=?` `implies 4a-4/a=-3` `implies a-1/a=(-3)/4` `implies (a-1/a)^(3)=((-3)/4)^(3)` [cubing both sides] `implies a^(3)-1/(a^(3))-3axx1/a(a-1/a)=(-27)/64` `implies a^(3)-1/(a^(3))-3xx (3/4)=(-27)/64` `implies a^(3)-1/(a^(3))=(-27)/64-9/4+3` `implies (192-171)/64impliesa^(3)-1/(a^(3))+3=21/64` |
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