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elricardo34
08.04.2021 •
Mathematics
What is the vertex of y = x2 + 4x – 7?
O(-4,-7)
O (2, 5)
0 (-2, -19)
0 (-2, -11)
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Ответ:
,
0
)
Method 1:
y
=
x
2
−
4
x
+
4
complete the square to get:
y
=
(
x
−
2
)
2
pick out the x value (2), and the y value (o)
to get:
(
2
,
0
)
method 2:
y
=
x
2
−
4
x
+
4
d
y
d
x
=
2
x
−
4
let
d
y
d
x
=
0
as the vertex is when the gradient of the curve is 0.
to get
x
=
2
substitute that into the original equation to get
(
2
,
0
)
Ответ:
The answer is B y: begins at 4, multiply by 1/2