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vodka [1.7K]
3 years ago
10

What is the discriminant of the quadratic equation -x^2-x-8=0?

Mathematics
1 answer:
Nat2105 [25]3 years ago
8 0

Answer:

-31

Step-by-step explanation:

See Image Below

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Distribute and simplify
SCORPION-xisa [38]

Answer:

440/5-100

Step-by-step explanation:

20(4 2/5 - 5)

4 0
3 years ago
Fun question: how can you make 11 out of 4 sevens?
Vladimir [108]

Answer: (7+1/7) *(7+7)

Step-by-step explanation:

7 0
3 years ago
How do you find a polynomial and factor it completely?
natulia [17]

a² + 10a + 16

Find two numbers whose product equals 16 and sum equals 10:

<u>Product = 16</u>               <u>Sum = 10</u>

    1 * 16                     1 + 16 = 17      <em>doesn't work</em>

    2 * 8                     2 + 8 = 10      THIS WORKS!

    4 * 4                      4 + 4 = 8      <em>doesn't work</em>

Since 2 & 8 satisfy our requirements, those are the values that go into the parentheses.

Answer: (a + 2)(a + 8)

Note: when there is a coefficient for a², a different method is used to find the factors.

6 0
3 years ago
The number of bacteria in a certain population increases according to a continuous exponential growth model, with a growth rate
Veronika [31]

It takes 8.35 hours for the size of the sample to double

Step-by-step explanation:

The form of the continuous exponential growth model is

A=Pe^{rt} , where

  • A is the new value
  • P is the initial value
  • r is the rate of growth or decay  in decimal
  • t is the time

∵ The growth rate is 8.3%

∴ r = 8.3 ÷ 100 = 0.083

∵ The size of the sample will doubled in t hours

∴ A = 2 P

Use the formula of the contentious exponential growth above

∵ 2P=Pe^{0.083t}

- Divide both sides by P

∴ 2=e^{0.083t}

- Insert ㏑ in both sides

∴ ln(2)=ln(e^{0.083t})

- Remember ln(e^{n})=n because ㏑(e) = 1

∴ ln(2)=0.083t

- Divide both sides by 0.083

∴ \frac{ln(2)}{0.083}=t

∴ t = 8.35 hours to the nearest hundredth

It takes 8.35 hours for the size of the sample to double

Learn more:

You can learn more about the logarithmic function in brainly.com/question/1447265

#LearnwithBrainly

4 0
4 years ago
3.<br>× 4.76<br> 3.36<br>plss help me​
arlik [135]
15.9936 if it says to round to the hundredth it would be 15.99
8 0
3 years ago
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