railway RRB Technician Grade 3 Mock Test 2024 Quantitative Aptitude Algebra Quadratic Equation

If the roots of the quadratic equation 9x2 + 6kx + 4 = 0 are equal, then the value of k is :  

1
-2 or 0
2
2 or 0
3
2 or -2
4
3 or -3
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