Xavier Sng's answer to rei's Secondary 2 Maths Singapore question.
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Hope this helps. Regards
Date Posted:
1 year ago
How did u get -4xy
X^2 + Y^2 - 2 XY
= X^2 + Y^2 + (2 XY - 2XY) - 2XY
= X^2 + Y^2 + 2XY - 4XY
= (X + Y)^2 - 4XY
Hope this helps. Regards
= X^2 + Y^2 + (2 XY - 2XY) - 2XY
= X^2 + Y^2 + 2XY - 4XY
= (X + Y)^2 - 4XY
Hope this helps. Regards
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