QuestionFor the quadratic function $f(x)=x^{2}+4 x-5$, answer parts (a) through ( $f$ ). (a) Find the vertex and the axis of symmetry of the quadratic function, and determine whether the graph is concave up or concave down.
The vertex is $(-2,-9)$. (Type an ordered pair, using integers or fractions.) What is the equation of the axis of symmetry? The axis of symmetry is $x=-2$. (Use integers or fractions for any numbers in the equation.) Is the graph concave up or concave down? Concave down Concave up (b) Find the $y$-intercept and the $x$-intercepts, if any.
What is the $y$-intercept? Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. The $y$-intercept is -5 . (Type an integer or a simplified fraction.) B. There is no $y$-intercept.
What is the x-intercept? Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. The $x$-intercept(s) is/áre $-5,1$. (Type an integer or a simplified fraction. Use a comma to separate answers as needed.) B. There is/are no x-intercept(s). (c) Use parts (a) and (b) to graph the function.
Use the graphing tool to graph the function. (d) Find the domain and the range of the quadratic function.
The domain of $f$ is $(-\infty, \infty)$. (Type your answer in interval notation.) The range of $f$ is $[-9, \infty)$. (Type your answer in interval notation.) (e) Determine where the quadratic function is increasing and where it is decreasing.
The function is increasing on the interval $\square$ (Type your answer in interval notation.)