Find the vertex -x square root of 2-8x+9=f(x)
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Answer:
To complete the square, add and subtract
(
b
2
)
2
=
16
y
=
x
2
+
8
x
+
16
−
16
−
9
y
=
(
x
2
+
8
x
+
16
)
+
(
−
16
−
9
)
y
=
(
x
+
4
)
2
−
25
The vertex is
(
−
4
,
−
25
)
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