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3 years ago

Multiply Which one ??? Please help

Mathematics

1 answer:

vladimir1956 [14]3 years ago

7 0

Answer:

The 3rd one again

Step-by-step explanation:

(a+−2)(8 $a^{2}$ +−5a+3)

=(a)(8 $a^{2}$ )+(a)(−5a)+(a)(3)+(−2)(8 $a^{2}$ )+(−2)(−5a)+(−2)(3)

=8 $a^{3}$ −5 $a^{2}$ +3a−16 $a^{2}$ +10a−6

=8 $a^{3}$ −21 $a^{2}$ +13a−6

hope this helped:)

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Inessa [10]

Answer:

If the roots of an equation are x = -1 ± i, it means that the factorized form of that equation is: (x + 1 + i)(x+ 1 - i) = 0.

Using the distributive property, we have:

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Combining like-terms and simplifying:

⇒ x^2 + x + x + 1 + 1 = x^2 + 2x + 2 = 0

Therefore, the stament is correct. If the roots of an equation are x = -1 ± i, then the equation is: x^2 + 2x + 2 = 0.

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3 years ago

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stich3 [128]

Answer:

$x = 1 + \sqrt{2} \ \ or \ 1- \sqrt{2}$

Step-by-step explanation:

Given;

x² - 2x - 1 = 0

Solve by completing the square method;

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x² - 2x = 1

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⇒ square half of coefficient of x and add it to the both sides of the equation

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Therefore, option B is the right solution.

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3 years ago

A survey of

Zina [86]

Answer:

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-The confidence interval can be determined as follows:

$CI=\hat p\pm z\sqrt{\frac{\hat p(1-\hat p}{n}}\\\\\hat p=x/n=16/400=0.04$

#We the use this proportion to find the CI at 95%:

$CI=0.04\pm 1.96\times \sqrt{\frac{0.04(1-0.04)}{400}}\\\\=0.04\pm 0.0192\\\\=[0.0208,0.0592]$

Hence, the 95% confidence interval is 0.0208<p<0.0592

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