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Mathematics
Mathematics
Problem
Let
f
:
R
→
R
f:\mathbb R\to\mathbb R
f
:
R
→
R
be defined by
f
(
x
)
=
x
2
+
4
x
+
7
f(x)=x^{2}+4x+7
f
(
x
)
=
x
2
+
4
x
+
7
. Find the set of all real numbers
y
y
y
for which the equation
f
(
x
)
=
y
f(x)=y
f
(
x
)
=
y
has at least one real solution.
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