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3 years ago

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Mathematics

1 answer:

frez [133]3 years ago

4 0

6y :))))))))))))))))))))))))))))))))))))))))))

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Find all the zeros of 2x4+x3-14x2-19x-6 two of its zeros are -2 and -1

GalinKa [24]

Answer:

$-2,\ -1,\ -\dfrac{1}{2},\ 3.$

Step-by-step explanation:

Consider polynomial $2x^4+x^3-14x^2-19x-6.$

If x=-2 is its zero, then you can divide the polynomial $2x^4+x^3-14x^2-19x-6$ by $x+2$ and get

$2x^4+x^3-14x^2-19x-6=(x+2)(2x^3-3x^2-8x-3).$

If x=-1, then the polynomial $2x^4+x^3-14x^2-19x-6$ can be rewritten as

$2x^4+x^3-14x^2-19x-6=(x+2)(x+1)(2x^2-5x-3).$

The quadratic polynomial has roots

$x_{1,2}=\dfrac{-(-5)\pm\sqrt{(-5)^2-4\cdot2\cdot(-3)}}{2\cdot 2}=\dfrac{5\pm \sqrt{25+24}}{4}=\dfrac{5\pm \sqrt{49}}{4}=3,-\dfrac{1}{2}.$

Then the polynomial $2x^4+x^3-14x^2-19x-6$ has zeros $-2,\ -1,\ -\dfrac{1}{2},\ 3.$

7 0

3 years ago

Which symbol correctly compares these two fractions? 6/9 ? 2/3. A = B < C >

brilliants [131]

Answer:

Step-by-step explanation:

You know that you can simplify 6/9 because both the numerator (top number) and denominator (bottom number) can be divided by 3. Therefore, you divide them by 3 to get 2/3. 2/3 cannot be simplified anymore. 2/3 is equal to 2/3. Therefore, the answer is A.

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5 0

3 years ago

Read 2 more answers

3. The following data was collected from a simple random sample from a process (an infinite population). 13 15 14 16 12 a. The p

SVETLANKA909090 [29]

Answer:

Step-by-step explanation:

Given the data:

13 15 14 16 12

The point estimate of the population mean will be :

ΣX/ n

X = Given data points

N = sample size

ΣX = (13 + 15 + 14 + 16 + 12) = 70

N = 5

Hence,

ΣX/ N = 70 / 5

Point estimate of population mean = 14

3 0

3 years ago

15 is equal to the difference of 7 and 2 times a number

tankabanditka [31]

Let, the number = x

15 = 7-2x

2x = 7-15

2x = -8

x = -4

5 0

3 years ago

2x-(10+4x)=3x-7 what is the answer

ZanzabumX [31]

X=-3/5

3
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5
X=-3/5 would be the answer

6 0

3 years ago