Answer:
(2, -8)
Step-by-step explanation:
(x, y)=(-3, -1)
(x1+x2)/2=-3,
(y2+y2)/2=-1,
-------------------
(x1+x2)/2=-3
(y1+y2)/2=-1
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x1-8=-6
x1=2
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y1+6=-2
y1=-8
The idea is to use the tangent line to at in order to approximate .
We have
so the linear approximation to is
Hence and .
Then
vertex and x= -b/2a = 0
second point, when x=1, y=3
third point the mirror of the second point over the vertex
Do as described