\[- x^{2} + 3x + 4 = 0\]
\[y = - x^{2} + 3x + 4\]
\[x_{b} = - \frac{b}{2a} = \frac{- 3}{- 2} = 1,5\]
\[y_{b} = - 2,25 + 4,5 + 4 = 6,25\]
\[x\] | \[- 1\] | \[0\] | \[1,5\] | \[3\] | \[4\] |
---|---|---|---|---|---|
\[y\] | \[0\] | \[4\] | \[6,25\] | \[4\] | \[0\] |
\[Ответ:\ - 1;4.\]