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Mathematics

Factorise the following:

9 - x2 + 2xy - y2.

Factorisation

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Answer

9 - x2 + 2xy - y2

Above terms can be written as,

9 - x2 + xy + xy - y2.

or,

9 - x2 + xy + 3x - 3x + 3y - 3y + xy - y2

Rearranging above terms, we get,

9 - 3x + 3y + 3x - x2 + xy + xy - 3y - y2.

Take out common in all terms we get,

3(3 - x + y) + x(3 - x + y) + y(-3 - y + x)

= 3(3 - x + y) + x(3 - x + y) - y(3 - x + y)

= (3 + x - y)(3 - x + y).

Hence, 9 - x2 + 2xy - y2 = (3 + x - y)(3 - x + y).

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