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3 years ago

What are the roots of the polynomial equation x^2-x72=0

Mathematics

1 answer:

Tom [10]3 years ago

8 0

I hope this helps you

x^2-x-72=0

x -9

x +8

(x-9)(x+8)=0

x=9

x= -8

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The sum of twice a number and 4 is equal to the sum of the number and 8

zalisa [80]

Answer:

Step-by-step explanation:

Variable: X = Unknown Number

2x + 4 = x + 8

2x - x = 8 - 4

x = 4

Check:

2(4) + 4 = 4 + 8

8 + 4 = 12

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3 years ago

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3 years ago

A leprechaun places a magic penny under a girls pillow. The next night there are 2 magic pennies under her pillow. The following

kiruha [24]

Answer:

After 47 days she will have more than 90 trillion pennies.

Step-by-step explanation:

At the beginning there was 1 penny. At the second day the amount of pennies under the pillow became 2.

The amount of pennies doubled each day. So the series is,

$1,2,4,8,16,32,.....$

This series is in geometric progression.

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where,

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r = common ratio = 2,

As we have find the number of days that would elapse before she has a total of more than 90 trillion, so

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$\Rightarrow 2^n\ge 90\times 10^{12}+1$

$\Rightarrow \log 2^n\ge \log (90\times 10^{12}+1)$

$\Rightarrow n\times \log 2\ge \log (90\times 10^{12}+1)$

$\Rightarrow n \ge \dfrac{\log (90\times 10^{12}+1)}{\log 2}$

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3 years ago

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Soloha48 [4]

Answer:

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Looking for key words in the problem:

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2 years ago

If the 6th term of an arithmetic progres- sion is 11 and the first term is 1, find the common difference.

Darina [25.2K]

Answer:

Step-by-step explanation:

An arithmetic progression with first term a and common difference d has the following first 6 terms:

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1 + 5d = 11

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3 0

2 years ago