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Identify the vertex first. Then use it to find the axis of symmetry.
Vertex: (0,- 5)
Axis of Symmetry: x=0
Graph:
We want to draw the graph of the given quadratic function. To do so, we will rewrite it in vertex form, f(x)=a(x-h)^2+k, where a, h, and k are either positive or negative numbers. g(x)=0.75x^2-5 ⇕ g(x)=0.75(x-0)^2-5 To draw the graph, we will follow four steps.
Let's get started.
We will first identify the constants a, h, and k. Recall that if a<0, the parabola will open downwards. Conversely, if a>0, the parabola will open upwards. Vertex Form:& f(x)= a(x- h)^2+k Function:& g(x)= 0.75(x- 0)^2+(- 5) We can see that a= 0.75, h= 0, and k=- 5. Since a is greater than 0, the parabola will open upwards.
Let's now plot the vertex ( h,k) and draw the axis of symmetry x= h. Since we already know the values of h and k, we know that the vertex is ( 0,- 5). Therefore, the axis of symmetry is the vertical line x= 0.
Note that both points have the same y-coordinate.
Finally, we will sketch the parabola which passes through the three points. Remember not to use a straightedge for this!