defence exam Agniveer Vayu Group X & XY Mock Test 01/2026 Quantitative Aptitude Algebra Quadratic Equation
What are the values of k for which the equation 4x2 - kx + 9 = 0 has real roots?
1
k ≤ -12 and k ≥ 12
2
-12 < k < 12
3
12 < k < -12
4
-12 ≤ k ≤ 12