Question

How to factorise the sum?

Answer 1

??? Dude, I have no clue.

Answer 2

$x {}^{2} + 2xy + y {}^{2} = (x + y) {}^{2}$

$- a {}^{2} + 2ab - b {}^{2} = - (a - b) {}^{2}$

Now equation can be written as

$(x + y) {}^{2} - (a - b) {}^{2}$

That's it

HOPE IT HELPS YOU

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