factorise (2a + 2b + 1) (2a - 2b+1)
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Step-by-step explanation:
2a(2a-2b+1)+2b(2a-2b+1)+1(2a-2b+1)
=4a square -4ab +2a + 4ba -4 b square + 2a-2b+1
=4a square -4ab + 4a + ab -4 b square + 2a- 2b +1
= 4a2 -4 b2 +4a +1
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