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mamaluj [8]
3 years ago
5

Solve x^2-3x-20=8 for quadratic equation​

Mathematics
2 answers:
lesya692 [45]3 years ago
4 0

We have

x^2-3x-20=8

First, move 8 to left side to get

x^2-3x-28=0

Rewrite x^2-3x-28 as (x-7)(x+4) to get

(x-7)(x+4)=0

The expression on the left equals zero if either of factors is zero thus the equation has 2 solutions

x-7=0\Longrightarrow\boxed{x_1=7}

x+4=0\Longrightarrow\boxed{x_2=-4}

Hope this helps.

snow_lady [41]3 years ago
3 0

Answer:

x = -7

x = 4

Step-by-step explanation:

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The number of violent crimes committed in a day possesses a distribution with a mean of 2.3 crimes per day and a standard deviat
marusya05 [52]

Answer:

B) approximately normal with mean 2.3 and standard deviation 2

Step-by-step explanation:

Given the following :

Mean crimes per day = 2.3

Standard deviation = 2

Number of samples = 100

Sampling distribution of the mean:

According to the central limit theorem:

Sample mean = population mean

2.3 = 2.3

The standard deviation of the sample (s) : ratio of the population standard deviation and square root of the sample size.

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3 years ago
9,583,402,167 which digit is in the 10 millions place
natta225 [31]

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2 years ago
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What is the first term of the geometric sequence presented in the table below?
Leto [7]
Fron the table given:

A3 = 112,
A8 = - 3,584

An = A1 *r ^ (n-1)

=> A3 = A1 (r^2) = 112

A8 = A1(r^7) = - 3,584

=> - 3584 / 112 = (r^7) / (r^2)

=> (r^5) = - 32

=> r = - 2

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3 years ago
-8<2x-4<4 solve the inequality
il63 [147K]

Answer:

Step-by-step explanation:

The inequality will be split into two

It is know that, if a<b<c

Then a<b and b<c

-8<2x-4<4

Apply that to this

Then,

-8<2x-4. Equation 1

Also,

2x-4<4 equation 2

Solving equation 1

-8<2x-4

Add 4 to both side of the equation

-8+4<2x-4+4

-4<2x

Divide both sides by 2

-4/2<2x/2

-2<x

Note, if a is less than b, then, b is greater than a, e.g. 4 is less than 10, this implies 10 is greater than 4

Therefore,

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Then, x greater than -2

Equation 2

2x-4<4

Add 4 to both side of the inequalities

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Divide both side by 2

Then,

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Therefore x is between -2 and +4.

Check attachment for graphical solution

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2 years ago
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