fid the factorise if (a+b)²-(a-b)²=?
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(a+b)²-(a-b)²?
(a+b)²=a²+b²+2ab…(1)
(a-b)²=a²+b²-2ab…(2)
Then .. (a²+b²+2ab)-(a²+b²-2ab)
Open the bracket.
a²+b²+2ab-a²-b²+2ab
=4ab answer
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