Mathematics
JAMB 1980
What will be the value of k so that the quadratic equation kx
2 - 4x + 1 = 0 has two equal roots?
-
A.
2
-
B.
3
-
C.
4
-
D.
8
-
E.
\(\frac{1}{4}\)
Correct Answer: Option C
Explanation
kx2 - 4x + 1 = 0, comparing with ax2 + bx + c = 0
a = k, b = -4, c = 1 for equal root b2 = 4ac
(-4)2 = 4k
k = \(\frac{16}{4}\)
= 4
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