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Mathematics
Problem
Which one of the following quadratic equations has two equal real roots? a)
x
2
+
4
x
+
5
=
0
x^2+4x+5=0
x
2
+
4
x
+
5
=
0
b)
x
2
+
4
x
+
1
=
0
x^2+4x+1=0
x
2
+
4
x
+
1
=
0
c)
x
2
+
4
x
+
4
=
0
x^2+4x+4=0
x
2
+
4
x
+
4
=
0
d)
x
2
+
5
x
+
4
=
0
x^2+5x+4=0
x
2
+
5
x
+
4
=
0
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