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3 years ago

How to work the problem 2u²=3u+2

Mathematics

2 answers:

vlabodo [156]3 years ago

6 0

U= -1/2, 2

Hope it helps

solong [7]3 years ago

4 0

One way is to subtract 3u and 2 to the other side to make this equation quadratic. Set it equal to 0 and solve with the quadratic formula. You should get the answers Bubbies15 commented.

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The minimum sample size required to create the specified confidence interval is 2229.

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Now, find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

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This is n when $M = 0.06, \sigma = 1.1$

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$0.06\sqrt{n} = 2.575*1.1$

$\sqrt{n} = \frac{2.575*1.1}{0.06}$

$(\sqrt{n})^{2} = (\frac{2.575*1.1}{0.06})^{2}$

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Rounding up

The minimum sample size required to create the specified confidence interval is 2229.

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