1) y = x^2 + 4x <=> y = (x + 2)^2 - 4 => Наименьшее при x = -2: y = -4
Наибольшее при x = 0: y = 0.
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1) y = x^2 + 4x <=> y = (x + 2)^2 - 4 => Наименьшее при x = -2: y = -4
Наибольшее при x = 0: y = 0.