x2+4x+4 = 25
x2+4x+4-25 = 0
x2+4x-21 = 0
(x+7)(x-3) = 0
x = -7 or x = 3
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No.
x^2+4x+7
2x = x2 + 4x - 3 x2 + 2x - 3 = 0 (x - 1)(x - 2) = 0
x2 + 4x + 3 = 0 (x + 1)(x + 3) = 0 x ∈ {-3, -1}
Y = x2 + 4x + 11OK. That's very interesting.Is there a question ?