Answer:
Step-by-step explanation:
a) We want to get the y-intercept
The y-intercept is simply the value at which the curve crosses the y-axis
From the given plot, we can see that the y-intercept value is at y = -8
b) Vertex
We can get the vertex at the tip of the plot
It is the point at which the cuurve splits into two at the tip.
When we draw a line through the vertex, we can have symmetric sides on the curve
We can see that the vertex here is at the point (1,-7)
c) Extreme value
Here, we want to get the extreme value
The extreme value differs based on the value of a (the leading coefficient which can be inferred from the direction the parabola faces)
As the parabola face downwards, the value of a is negative
So what we have is a maximum value which can be obtained at the vertex
The maximum value here is simply the y-value of the vertex which is -7