state gov TSPSC Forest Beat Officer (ఫారెస్ట్ బీట్ ఆఫీసర్) Mock Test 2023 Quantitative Aptitude Algebra Quadratic Equation

Let a = b + c. Then the equation ax2 + bx - c = 0 has equal roots if

1
a = c
2
​a = ­ -c
3
a = 2c
4
a = ­ -2c
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