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strojnjashka [21]
3 years ago
15

How to solve the Quadratic formul​

Mathematics
1 answer:
Marat540 [252]3 years ago
7 0

Answer:

The answer is x=-6, x=8

Step-by-step explanation:

I recommend using the quadratic formula to solve this problem.

x^2=a

-2x=b

-48=c

Plug it into the quadratic formula.

New equation:\frac{2+-\sqrt{(-2)^2-4(1)(-48)}}{2(1)}

Simplify

Equation: \frac{2+-\sqrt{4+192}}{2}

Add 4 and 192.

Equation: \frac{2+-\sqrt{196}}{2}

Do the square root of 196.

Equation: \frac{2+-14}{2}

Make into two different equations.

Equation 1: \frac{2+14}{2}

Equation 2: \frac{2-14}{2}

Solve the two equations and you will get -6 and 8.  Hope this helps!

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Answer:

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A leprechaun places a magic penny under a girl's pillow. The next night there are 2 magic pennies under her pillow. The followin
dezoksy [38]

Answer:

<u><em></em></u>

  • <u><em>32 days</em></u>

Explanation:

Simulate (build a table) the growing of the number of pennies for some nights to figure out the pattern:

First night:          1 penny = 2⁰

Second night:    1 × 2 pennies = 2¹

Third night:        2 × 2 = 2²

Fourth nigth:      2² × 2 = 2³

nth night:           2ⁿ⁻¹

You want 2ⁿ⁻¹ ≥ 2,000,000,000

Which you solve in this way:

  • 2ⁿ⁻¹  ≥ 2,000,000,000

  • 2ⁿ⁻¹ ≥ 2,000,000,000

  • n-1 log (2)  ≥ log (2,000,000,000)

  • n - 1  ≥ log (2,000,000,000) / log (2)

  • n - 1 ≥ 30.9

  • n ≥ 31.9

Since n is number of days, it is an integer number, so n ≥ 32.

Hence, she will have a total of more than $ 2 billion after 32 days.

You can prove that by calculating 2³² = 2,147,483,648.

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Its 11, hope I helped;)


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