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Problem
Problem
The curve
x
+
y
−
ln
(
x
+
y
)
=
2
x
+
5
x + y - \ln(x + y) = 2x + 5
x
+
y
−
ln
(
x
+
y
)
=
2
x
+
5
has a vertical tangent at the point
(
α
,
β
)
(\alpha, \beta)
(
α
,
β
)
. Then,
α
+
β
\alpha + \beta
α
+
β
is equal to a.
−
1
-1
−
1
b. 1 c. 2 d.
−
2
-2
−
2
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