ax2 + bx + c = 0 সমীকরণের মূল দুইটি মূলদ হবে যদি--
b2 > 4ac
b2 - 4ac একটি পূর্ণবর্গ সংখ্যা হয়
b2 < 4ac
কোনটিই নয়
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