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

kx^{2} – 4x + 1 = 0, comparing with ax^{2} + bx + c = 0

a = k, b = -4, c = 1 for equal root b^{2} = 4ac

(-4)^{2} = 4k

k = (frac{16}{4})

= 4