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

जर वर्गसमीकरण x 2 + kx + 9 ची मुळे समान असतील तर K चे मूल्य शोधा?
 

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