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Mathematics
Problem
Which one of the following quadratic equations represents a parabola that touches the
x
x
x
-axis exactly once? a)
x
2
+
4
x
+
1
=
0
x^{2}+4x+1=0
x
2
+
4
x
+
1
=
0
b)
x
2
−
6
x
+
8
=
0
x^{2}-6x+8=0
x
2
−
6
x
+
8
=
0
c)
x
2
−
6
x
+
9
=
0
x^{2}-6x+9=0
x
2
−
6
x
+
9
=
0
d)
3
x
2
+
2
x
+
5
=
0
3x^{2}+2x+5=0
3
x
2
+
2
x
+
5
=
0
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