"When the radicand equals zero" is the one among the following choices given in the question that you can tell when <span>a quadratic equation has two identical, rational solutions. The correct option among all the options that are given in the question is the fourth option or option "d". I hope the answer has helped you.</span>
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still need it?...........
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all real numbers greater than or equal to 2
which is [2, infinite)
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your answer would be 20 because you would find what both can go into.