Factorise. 25 (a +b)²- (a-b)²
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Answer:
5²+4ab
Step-by-step explanation:
25(a+b)²-(a-b)²
=5²(a²+b²+2ab) -(a²+b²-2ab)
=5²(a²+b²+2ab-a²-b²+2ab)
=5²+4ab
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