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4 years ago

Which are the solutions of x^2 = -13x – 4?

Mathematics

1 answer:

Pani-rosa [81]4 years ago

7 0

Answer:

Step-by-step explanation:

Rewrite this equation in standard quadratic form: x^2 + 13x + 4 = 0.

Here the coefficients are 1, 13 and 4, so the discriminant is

b^2-4ac, or 169 - 4(1)(4) = 153

Since the discriminant is + there are two real, unequal roots. They are:

-13 ± √153

x = ------------------

x = ----------------

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Help pls............

Fantom [35]

The correct answer would be 9%

7 0

3 years ago

How can you write 52+(8+25)to make it easier to add?

Vesna [10]

,52+(8+25)
=52+33
=88

hope this helps

4 0

3 years ago

Read 2 more answers

An analytical laboratory is asked to evaluate the claim that the concentration of the active ingredient in a specimen is 86%. Th

Olenka [21]

Answer:

Decision rule

Reject null hypothesis

Conclusion

There is significance evidence that the true mean is different from 0.86

Step-by-step explanation:

From the question we are told that

The population mean $\mu = 0.86$

The sample is mean is $\= x = 0.8708$

The standard deviation is $\sigma = 0.0068$

The level of significance is $\alpha = 0.01$

The sample size n = 3

The null hypothesis is $\mu = 0.86$

The alternative hypothesis is $\mu \ne 0.86$

Generally the test statistics is mathematically represented as

$z = \frac{\= x - \mu }{ \frac{\sigma}{\sqrt{n} } }$

=> $z = \frac{ 0.8708 - 0.86 }{ \frac{0.0068}{\sqrt{3} } }$

=> $z = 2.751$

Generally p- value is mathematically represented as

$p-value = 2 P(z >2.751 )$

From the z-table

$P(z >2.751 ) = 0.0029707$

$p-value = 2 * 0.0029707$

=> $p-value = 0.00594$

From the obtained question we see that $p-value < \alpha$

Hence we reject the null hypothesis

6 0

3 years ago

Pls give me the correct answer.

Jobisdone [24]

Answer:

2,7,9,11,12

and

v≤−12

hope this helps ! :)

3 0

3 years ago

Find the slope of the line that passes through (3, 2) and (7,5)

Bas_tet [7]

Answer:

$\frac{3}{4}$

Step-by-step explanation:

Slope is equal to the change in y over the change in x.

$m = \frac{change \: in \: y}{change \: in \: x}$

The change in x is equal to the difference in x-coordinates, and the change in y is equal to the difference in y-coordinates .

$m = \frac{y2 - y1}{x2 - x1}$

Substitute in the values of x and y into the equation to find the slope.

$m = \frac{5 - (2)}{7 - (3)}$

Simplify.

$m = \frac{3}{4}$

Hence, the slope is 3/4.

6 0

3 years ago