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3 years ago

How to do this? I'm not sure.

Mathematics

1 answer:

Nady [450]3 years ago

7 0

U have to common factor that add up to -5 but times to 4 so basically the answer would be (x+5)(x-1)= 0 then you would get
x+5=0
x-1=0
both x’s are going to be different and have to equal to zero
x=-5
x=1

for the other one u just have to get two number that multiply to -49
x^2=-49
u square root the -49 and get -7 but u have to have both a positive and negative for 7
so
x=-7
x=7

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3 years ago

If the equation y² - (K-<br>2y + 2k +1 = 0<br>with equal roots find the value of k

777dan777 [17]

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D= b^2 - 4ac

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8 0

3 years ago

A book has 200 pages. The number of mistakes on each page is a Poisson random variable with mean 0.01, and is independent of the

aleksandr82 [10.1K]

Answer:

198 pages have no mistakes.

Step-by-step explanation:

We are given the following in the question:

The number of mistakes on a page follows a poison distribution with

$\mu = \lambda = 0.01$

Formula:

$P(X =k) = \displaystyle\frac{\lambda^k e^{-\lambda}}{k!}\\\\ \lambda \text{ is the mean of the distribution}$

We have to find the probability that there are no mistakes on a page.

$P(X =0) = \displaystyle\frac{(0.01)a^0 e^{-0.01}}{0!} = 0.9901$

Thus, approximately 99.01% of the pages have no mistakes.

Number of pages =

$\text{Total number of pages}\times 99.01\%\\\\200\times \dfrac{99.01}{100}\\\\\approx 198$

Thus, 198 pages have no mistakes.

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4 years ago