Q. 54.4( 104 Votes )

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Answer :

Let k should be taken away from 3x2 - 4y2 + 5xy + 20


3x2 - 4y2 + 5xy + 20 - k = -x2 - y2 + 6xy + 20


k = 3x2 - 4y2 + 5xy + 20 - (-x2 - y2 + 6xy + 20)


k = 3x2 - 4y2 + 5xy + 20 + x2 + y2 - 6xy - 20


k = 4x2 - 3y2 - xy

Hence value of k is 4x2 - 3y2 - xy.

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