= (a + b)2 or (a + b)(a + b)
(a + b)(a + b) using the FOIL method yields:
[multiplying {First Outer Inner Last} and summing the products]
= a.a + a.b + b.a + b.b
= a2 + ab + ab + b2
= a2 + 2ab + b2
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12a2b + 6a = 6a(2ab + 1)
b/2=2ab/+b means112.5
5ab-2ab+4a-b+5b = 3ab+4a+4b
a square plus 2ab plus b square
12a2/(2ab) = 6a/b