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Mathematics
Problem
Let two numbers have arithmetic mean 9 and geometric mean 4. Then these numbers are the roots of the quadratic equation [2004] (a)
x
2
−
18
x
−
16
=
0
x^2 - 18x - 16 = 0
x
2
−
18
x
−
16
=
0
(b)
x
2
−
18
x
+
16
=
0
x^2 - 18x + 16 = 0
x
2
−
18
x
+
16
=
0
(c)
x
2
+
18
x
−
16
=
0
x^2 + 18x - 16 = 0
x
2
+
18
x
−
16
=
0
(d)
x
2
+
18
x
+
16
=
0
x^2 + 18x + 16 = 0
x
2
+
18
x
+
16
=
0
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