\[y = 0,5x² - x - 1,5\]
\[x\] | \[- 2\] | \[- 1\] | \[0\] | \[1\] | \[2\] | \[3\] |
---|---|---|---|---|---|---|
\[y\] | \[2,5\] | \[0\] | \[- 1,5\] | \[- 2\] | \[- 1,5\] | \[0\] |
\[x_{b} = - \frac{b}{2a} = \frac{1}{1} = 1\]
\[y_{b} = 0,5 - 1 - 1,5 = - 2\]
\[y \nearrow \ \ при\ x \in ( - \infty;1\rbrack\]
\[y \searrow \ \ при\ x \in \lbrack 1; + \infty)\]