If `a^4+1/a^4=50, a>0`, then find the value of `a^3+1/a^3` .
यदि `a^4+1/a^4=50, a>0` है, तो `a^3+1/a^3` का मान ज्ञात करें ।

Options

A. `sqrt( 2 ( 1+ sqrt(13) ) ) + ( 1- + 2 sqrt( 13) )`
B. `sqrt( 2 ( 1 + sqrt( 13) ) ) - ( -1 - 2 sqrt(13) ) `
C. `sqrt( 2 ( 1 + sqrt( 13) ) ) ( - 1 + 2 sqrt(13) )`
D. `sqrt( 2 ( 1 - sqrt( 13) ) ) ( - 1 + 2 sqrt(13) )`

Answer

C