engineering recuitment NPCIL Plant Operator Mock Test Mathematics Quadratic Equations

यदि समीकरण ax2 + bx + c = 0 के मूल समान हैं और विपरीत चिह्न के हैं, तो निम्न में से कौन-सा कथन सही है?

1
a = 0.
2
b = 0.
3
c = 0.
4
None of these.
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