railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Quantitative Aptitude Algebra

যদি বহুপদ x 2 + 9x + 3k এর শূন্যের বর্গের যোগফল 21 হয়, তাহলে k-এর মান কত?

1
-17
2
10
3
30
4
20
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