\[\boxed{\text{114.\ }\text{ОК\ ГДЗ\ -\ домашка\ на\ 5}}\]
\[\textbf{а)}\ y = x^{2} + 1\]
\[x\] | \[- 2\] | \[- 1\] | \[0\] | \[1\] | \[2\] |
---|---|---|---|---|---|
\[y\] | \[5\] | \[2\] | \[1\] | \[2\] | \[5\] |
\[D(y) = ( - \infty; + \infty).\]
\[E(y) = \lbrack 1; + \infty).\]
\[Нули\ функции:x = 0.\]
\[f(x) > 0\ при\ \ ( - \infty; + \infty).\]
\[Возрастает\ на\ \lbrack 0; + \infty);\]
\[убывает\ на\ ( - \infty;0\rbrack.\]
\[y_{\min} = 1\ при\ x = 0.\]
\[Четная.\]
\[\textbf{б)}\ y = - x^{2} + 4\]
\[x\] | \[- 2\] | \[- 1\] | \[0\] | \[1\] | \[2\] |
---|---|---|---|---|---|
\[y\] | \[0\] | \[3\] | \[4\] | \[3\] | \[0\] |
\[D(y) = ( - \infty; + \infty).\]
\[E(y) = ( - \infty;4\rbrack.\]
\[Нули\ функции:x = \pm 2.\]
\[f(x) < 0\ при\ \ x < - 2;\ \ x > 2;\]
\[f(x) > 0\ при\ ( - 2;2).\]
\[Убывает\ на\ \lbrack 0; + \infty);\]
\[возрастает\ на\ ( - \infty;0\rbrack.\]
\[y_{\max} = 4\ при\ x = 0.\]
\[Четная.\]