Find the least positive value of `k` for which the equation `x^2+k x+4=0` has real roots.

Explanation

To find the least positive value of \( k \) for which the equation \( x^2 + kx + 4 = 0 \) has real roots, we can use the discriminant condition of a quadratic equation. The discriminant \( D \) is given by:

\[ D = b^2 - 4ac \]

For the quadratic equation \( ax^2 + bx + c = 0 \):
- \( a = 1 \) (coefficient of \( x^2 \))
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