y = x²-8x-9
x(в) = -b/2a = -(-8)/2 = 4
y(в) = -25
Ответ: E(y) x ∈ [-25;+∞)
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y = x²-8x-9
x(в) = -b/2a = -(-8)/2 = 4
y(в) = -25
Ответ: E(y) x ∈ [-25;+∞)