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Mathematics
Mathematics
Problem
If
a
,
b
,
c
a, b, c
a
,
b
,
c
be the sides of
△
A
B
C
\triangle ABC
△
A
B
C
and equations
a
x
2
+
b
x
+
c
=
0
ax^2 + bx + c = 0
a
x
2
+
b
x
+
c
=
0
and
5
x
2
+
12
x
+
13
=
0
5x^2 + 12x + 13 = 0
5
x
2
+
12
x
+
13
=
0
have a common root, then
∠
C
\angle C
∠
C
is : (a)
60
∘
60^\circ
6
0
∘
(b)
90
∘
90^\circ
9
0
∘
(c)
120
∘
120^\circ
12
0
∘
(d)
45
∘
45^\circ
4
5
∘
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