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Problem
Problem
A value of
b
b
b
for which the equations
x
2
+
b
x
−
1
=
0
x^2 + bx - 1 = 0
x
2
+
b
x
−
1
=
0
and
x
2
+
x
+
b
=
0
x^2 + x + b = 0
x
2
+
x
+
b
=
0
have one root in common, is a.
−
2
-\sqrt{2}
−
2
b.
−
i
3
,
i
=
−
1
-i\sqrt{3}, i = \sqrt{-1}
−
i
3
,
i
=
−
1
c.
i
5
,
i
=
−
1
i\sqrt{5}, i = \sqrt{-1}
i
5
,
i
=
−
1
d.
2
\sqrt{2}
2
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