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kendall984
29.07.2019 •
Mathematics
2. how can you tell when a quadratic equation has two identical, rational solutions? (1 point) when the radicand is negative when b in the quadratic formula is greater than the radicand when the radicand equals zero when the radicand is not a perfect square,
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Ответ:
ax² + bx + c = 0
are given by:
x₁₂ = [- b +- √(b²-4ac) ] / 2a
You have three cases:
1) the radicand is positive: you then have two dinstinct soutions, one with the root added to (-b) and then divided by 2a, and the other one with the root subtracted to (-b) and then divided by 2a.
2) the radicand is negative: you then have no solutions, because the root can't be performed. This case means that the given polynomial is never equal to zero.
3) the radicand is equal to zero: you then have the same value for both the solutions, which is -b/(2a).
Therefore your answer should be: C) when the radicand is equals to zero.
Ответ: