What will be the value of k so that the quadratic equation kx2 – 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