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taurus [48]
3 years ago
15

I am so confused please help

Mathematics
2 answers:
Lemur [1.5K]3 years ago
6 0

Answer:

a. 2\sqrt{31}

b. 3

c.  3\sqrt{5}

d. 2\sqrt{3}

Step-by-step explanation:

This is a simple quadratic formula "substitution".

Essentially what you do is replace the "b" in the formula given above, with a "b" value from your given choices, same goes for "a" and "c" values.

You replace them and then solve the quadratic formula equation.

Ex. For the first set of values in your question, you make the formula into:

\sqrt{2^2-4(5)(-6) And there you would solve normally.

2 squared is 4, so you get 4 - [4 * 5 * -6]

Which after solving leaves you with: \sqrt{2^2+124}

Then you do Prime Factorization of 124, leaving you with: \sqrt{2^2*31}

Then you apply the radical rule, leaving you with: 2\sqrt{31}

Marysya12 [62]3 years ago
3 0

Step-by-step explanation:

This is a simple quadratic formula "substitution".

Essentially what you do is replace the "b" in the formula given above, with a "b" value from your given choices, same goes for "a" and "c" values.

You replace them and then solve the quadratic formula equation.

Ex. For the first set of values in your question, you make the formula into:

And there you would solve normally.

2 squared is 4, so you get 4 - [4 * 5 * -6]

Which after solving leaves you with:

Then you do Prime Factorization of 124, leaving you with:

Then you apply the radical rule, leaving you with:

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I hope this helps you



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2×-6/3×5


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3 years ago
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OlgaM077 [116]

Answer:

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One marble is randomly drawn and then replaced from a jar containing two white marbles and one
melisa1 [442]

Answer:

1/3.

Step-by-step explanation:

Prob(Drawing white marble) = 2/3

Prob(Drawing a black marble on second draw ) =  1/2

So:

Prob(Drawing a white then a red marble) = 2/3 * 1/2

= 2/6

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2 years ago
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solniwko [45]

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Step-by-step explanation:

4 0
3 years ago
The sum of the first n consecutive even numbers can be found using S=n2+n, where n≥2. What is the value of n when the sum is 42?
lawyer [7]

Answer:

  • C. 6

Step-by-step explanation:

<u>Given</u>

  • S = n² + n
  • S = 42, n = ?

<u>Substitute and solve for n:</u>

  • 42 = n² + n
  • n² + 2*1/2n + 1/4 = 42.25
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  • n + 0.5 = √42.25
  • n + 0.5 = 6.5
  • n = 6

Correct option is C

5 0
2 years ago
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