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Автор - noname9384

вершина параболы y=-x^2+4x-1 имеет координаты 1)(-2;-13) 2)(-2;3) 3)(2;-3) 4)(2;3) 5)(2;4)​

Ответ

Проверено экспертом

Автор - Trover

A = left(-frac b{2a};;frac{4ac-b^2}{4a}right)=left(-frac4{-1};;frac{4cdot1cdot(-1)-4^2}{4cdot(-1)}right)=left(2;;3right)

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