The value of x'+7 when x = -4 is
(a) 15
(b) 19
Answers
Answered by
1
Answer:
When given an equation of the form
y
=
a
x
2
+
b
x
+
c
, where "a" is negative, the maximum value is the y coordinate of the vertex. The x coordinate of the vertex is:
h
=
−
b
2
a
Explanation:
Given:
y
=
−
16
x
2
+
160
x
−
256
We observe that
a
=
−
16
and
b
=
160
The x coordinate of the vertex is:
h
=
−
b
2
a
h
=
−
160
2
(
−
16
)
h
=
5
←
this is the answer to [7.a.i]
The maximum value is the function evaluated at
x
=
h
=
5
:
y
=
−
16
(
5
)
2
+
160
(
5
)
−
256
y
=
144
←
this is the answer to [7.a.ii]
answer
Answered by
0
Answer:
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