factorise 4(2a +b)²-(a-b)²
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Answer:
5a²+b²+6ab
Step-by-step explanation:
4(2a+b)²-(a-b)²
=4(4a²+4ab+b²)-(a²-2ab+b²)
=16a²+16ab+4b²-a²+2ab-b²
=16a²-a²+4b²-b²+16ab+2ab
=15a²+3b²+18ab
=5a²+b²+6ab
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