Question

Use the parabola tool to graph the quadratic function f(x)=−5x2−2.

Graph the parabola by first plotting its vertex and then plotting a second point on the parabola.

Answer 1

Answer:(0,-2) (1,-7)

Explanation:

Answer 2

`\text{Consider the quadratic function}\\ \\ f(x)=-5x^2-2\\ \\ \text{For a quadratic equation, }f(x)=ax^2+bx+c, \text{ we know that the x-coordinate}\\ \text{of the vertex (h,k) is given by}\\ \\ h=(-b)/(2a)\\ \\ \text{on comparing the given equation with standard equation, we have}`

`a=-5, b=0, c=-2\\ \\ \text{so the x-coordinate of the vertex is }\\ \\ h=-(b)/(2a)=-(0)/(2(-5))=0\\ \\ \text{so plug this vlaue of the h in the given function to get the y-coordinate}\\ \text{of the vertex. so}\\ \\ f(x)=-5(0)^2-2=0-2=-2\\ \\ \text{hence the vertex of the parabola is: }(h,k)=(0,\ -2)\\ \\ \text{A second point on the graph can be found by putting x=1, so }\\ \\ f(1)=-5(1)^2-2=-5-2=-7\\ \\ \text{so one other point on the parabola is }(1,-7)`

The grpah of the quadratic function is shown below: