1.

व्यंजक `x^(4)-2x^(2)+k` एक पूर्ण वर्ग होगा जब `k` का मान होगाA. 2B. 1C. -1D. -2

Answer» Correct Answer - B
`x^(4)-2x^(2)+k`
`implies (A+B)^(2)=A^(2)+2AB+B^(2)`
`(A-B)^(2)=A^(2)-2AB+B^(2)`
`implies (x^(2))^(2)-2xx x^(2)+k`
`(A)^(2)-2xx AB+B^(2)`
`:. A=x^(2),B=-1`
`B^(2)=K`
`(-1)^(2)=K`
`K=1`


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