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Anastasy [175]
3 years ago
9

Help please, I attached the question. Is it a!? 

Mathematics
2 answers:
olga nikolaevna [1]3 years ago
8 0
The answer to this is A
AVprozaik [17]3 years ago
3 0

Answer:

A

Step-by-step explanation:

Recall that for a quadratic equation of the form:

0=ax^2+bx+c

The number of solutions it has can be determined using its discriminant:  

\Delta = b^2-4ac

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:

2x^2+5x-k=0

Thus, <em>a</em> = 2, <em>b</em> = 5, and <em>c</em> = -<em>k</em>.

In order for the equation to have exactly one distinct solution, the discriminant must equal zero. Hence:

b^2-4ac=0

Substitute:

(5)^2-4(2)(-k)=0

Solve for <em>k</em>. Simplify:

25+8k=0

Solve:

\displaystyle k = -\frac{25}{8}

Thus, our answer is indeed A.

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A diagram is attached. Sorry it's kinda messy.

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Surface Area of Cylinders - Item 1175
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Step-by-step explanation:

Given,

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