\[\boxed{\text{359\ (359).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[x\] | \[0\] | \[1\] |
---|---|---|
\[y\] | \[3\] | \[2\] |
\[y = - 3\ (прямая).\]
\[y = x^{2} - 2x - 3\]
\[a = 1 > 0 - ветви\ вверх.\]
\[x_{0} = \frac{2}{2} = 1;\]
\[y_{0} = 1 - 2 - 3 = - 4.\]
\[(1; - 4) - вершина\ параболы.\]
\[Ox:\ \ \]
\[x^{2} - 2x - 3 = 0\]
\[x_{1} + x_{2} = 2,\ \ x_{1} = 3\]
\[x_{1} \cdot x_{2} = - 3,\ \ x_{2} = - 1.\]
\[(3;0),\ \ ( - 1;0).\]
\[\text{Oy}:\ \ \ \]
\[x = 0,\ \ y = - 3;\ \ (0; - 3).\]
\[y( - 2) = 4 + 4 - 3 = 5.\]
\[E(y) = \lbrack - 4;\ + \infty);\]
\[убывает:( - \infty;1\rbrack,\ \ \]
\[возрастает:\ \ \lbrack 1;2\rbrack.\]