(a + b)2 = a2 + 2ab + b2.
Примеры.
(x + 2)2 = x2 + 4x + 4
(3 + 2a)2 = 9 + 6a + 4 a2
(5 + 100)2 = 52 + 2 ⋅ 5 ⋅ 100 + 1002 = 25 + 1000 + 10000 = 11025.
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