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olga nikolaevna [1]
2 years ago
13

Which two values of x are roots of the polynomial below?

Mathematics
1 answer:
Julli [10]2 years ago
4 0

Answer:

B. and C.

Step-by-step explanation:

1. Set the polynomial equal to zero:

x² + 5x + 7 = 0

2. Plug the given values of a, b, and c into the quadratic formula:

x=\frac{-5+-\sqrt{5^{2}-4(1)(7) } }{2(1)}

3. Solve the square root:

x=\frac{-5+-\sqrt{25-4(1)(7)} }{2(1)}

x=\frac{-5+-\sqrt{25-28} }{2(1)}

x=\frac{-5+-\sqrt{-3} }{2(1)}

4. Simplify the rest:

x=\frac{-5+-\sqrt{-3} }{2}

5. Separate the solutions:

x=\frac{-5+\sqrt{-3} }{2}  , x=\frac{-5-\sqrt{-3} }{2}

Thus, options B and C are the answers.

hope this helps!

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Answer:

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Step-by-step explanation:

Given that :

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Standard deviation, σ = 110

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Z = (x - μ) / σ

Z = (1305 - 1220) / 110

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If the radius of mars is about 13.7% of neptune's radius, what is the radius of neptune?
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The volumetric mean radius of Mars is about 3389.5 km. We know that it's 13.7% of Neptune's mean radius, so we can write it down as:

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