p(x) is a polynomial given by: p(x) = -2x + 8x^{2} - 1

At which of the following points will the graph of p(x) intersect the positive x-axis?

(i) 1/2

(ii) 1/4

(a) only (i)

(b) only (ii)

(c) both (i) and (ii)

(d) (none, it never intersects positive x -axis)