DragonWarrior203
23.07.2021 •
Mathematics
Help please, I attached the question. Is it a!?

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Ответ:
A
Step-by-step explanation:
Recall that for a quadratic equation of the form:
The number of solutions it has can be determined using its discriminant:
Where:
If the discriminant is positive, we have two real solutions. If the discriminant is negative, we have no real solutions. And if the discriminant is zero, we have exactly one solution.We have the equation:
Thus, a = 2, b = 5, and c = -k.
In order for the equation to have exactly one distinct solution, the discriminant must equal zero. Hence:
Substitute:
Solve for k. Simplify:
Solve:
Thus, our answer is indeed A.
Ответ:
7,13
Step-by-step explanation: