factorise: (A+2b)^2 - A^2
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(A+2B)²-A²
A²+4B²+4AB - A²
= 4B²+4AB = 4B(A+B)
A²+4B²+4AB - A²
= 4B²+4AB = 4B(A+B)
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(A+2b+A) (A+2b-A)
(2A+2b) (2b)
2(A+b) (2b)
(2A+2b) (2b)
2(A+b) (2b)
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