defence exam Agniveer Navy MR Mock Test Series 2025 Quantitative Aptitude Algebra Quadratic Equation

যদি একটি দ্বিঘাত সমীকরণ x2 + kx + 9-এর বীজগুলি সমান হয়,তাহলে K র মান কত?

1
81
2
± 8
3
± 6
4
\(\frac{1}{{81}}\)
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