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 - xyHence value of k is 4x2 - 3y2 - xy.

Q. 54.4( 104 Votes )

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Class 7th NCERT Mathematics 12. Algebraic Expressions

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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