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Mathematics
Mathematics
Problem
2. The function
f
(
x
)
=
−
2
⋅
5
x
f(x)=-2\cdot5^{x}
f
(
x
)
=
−
2
⋅
5
x
is defined for all real
x
x
x
. Which of the following is its range? a)
(
−
∞
,
−
2
]
(-\infty,-2]
(
−
∞
,
−
2
]
b)
(
−
∞
,
0
)
(-\infty,0)
(
−
∞
,
0
)
c)
(
0
,
∞
)
(0,\infty)
(
0
,
∞
)
d)
(
−
∞
,
0
]
(-\infty,0]
(
−
∞
,
0
]
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