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cofactors (
0
9
3
2
0
4
3
7
0
)
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Solution
(
−28
12
14
21
−9
27
36
6
−18
)
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Solution steps
Solve by:
Find vertex using averaging the zeros
Find vertex using averaging the zeros
Find vertex using polynomial form
Find vertex using parabola form
Find vertex using vertex form
One step at a time
y=−(x+3)220+1
Parabola equation in factored form
The vertex of an up-down facing parabola of the form y=a(x−m)(x−n)is the average of the zeros xv=m+n2
y=−(x+3)220+1
The parabola parameters are:
a=−120,m=2√5−3,n=−2√5−3
xv=m+n2
xv=(2√5−3)+(−2√5−3)2
Simplify (2√5−3)+(−2√5−3)2:−3
xv=−3
Plug in xv=−3to find the yvvalue
yv=1
Therefore the parabola vertex is
(−3,1)
If a<0,then the vertex is a maximum value If a>0,then the vertex is a minimum value a=−120