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3 years ago

Pls help

Mathematics

2 answers:

sweet [91]3 years ago

7 0

Answer:

Step-by-step explanation:

Given

x² + 2x + 8 ( to find the solutions equate to zero )

x² + 2x + 8 = 0 ( subtract 8 from both sides )

x² + 2x = - 8

To solve we can use the method of completing the square

add ( half the coefficient of the x- term )² to both sides

x² + 2(1)x + 1 = - 8 + 1

(x + 1)² = - 7 ( take the square root of both sides )

x + 1 = ± $\sqrt{-7}$ = ± i $\sqrt{7}$

Subtract 1 from both sides )

x = - 1 ± i $\sqrt{7}$

astra-53 [7]3 years ago

4 0

Answer:

2+i times the square root of 7

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Select the correct answer.<br> What is the domain of the function shown on the graph?

maw [93]

Answer:

B. negative infinity < x < positive infinity

Step-by-step explanation:

When a question asks for the domain of a function, it is asking for all possible x-values, so we can rule out choice A since there are clearly x-values greater than 1. This graph shows arrows pointing left and downward, indicating that the graph continues past what we can see. This tells us that even though the x-values look like they end at -10 and 2, they continue further, so we can also rule out option C and option D. After these eliminations, we are left with choice B, which is a way of writing "All real numbers," and is the domain for <u>all</u> exponential functions, including this one.

lmk if im incorrect about anything, hope this helps :)

5 0

3 years ago

Help me pleaseeee!!!

Colt1911 [192]

Answer:

Slope = 3

Step-by-step explanation:

Because it increases by 3 each time.

3 0

4 years ago

Please simplify this please it’s due really soon!

iren2701 [21]

Step-by-step explanation:

$\frac{ {13}^{6} \div {13}^{8} \times {13}^{ - 4} }{ {13}^{ - 2} }$

You need to remember the properties of exponents: multiplication adds the exponents, division subtracts the exponents.

If you multiply two powers with the same base, the result will be the base to the sum of the powers.

If you divide two powers with the same base, the result will be the base to the difference of the powers.

In your case you will this:

${13}^{6 - 8 + ( - 4) - ( - 2)}$

That is:

${13}^{ - 4}$

Or:

$\frac{1}{ {13}^{4} }$

7 0

4 years ago

CB = 4, CA = 11 , and CE = 8 , what is the length of overline ET ?

erma4kov [3.2K]

AB=11-4=7

$\\ \rm\hookrightarrow \dfrac{BC}{AB}=\dfrac{CE}{ET}$

ET be x

$\\ \rm\hookrightarrow \dfrac{4}{7}=\dfrac{8}{x}$

$\\ \rm\hookrightarrow 4x=56$

$\\ \rm\hookrightarrow ET=x=14$

8 0

2 years ago

Slope -3/7 and goes thru (9,-11)

goblinko [34]

The equation of line is ,

$\begin{gathered} (y-(-11))=\frac{-3}{7}(x-9) \\ y+11=\frac{-3}{7}x+\frac{27}{7} \\ y=\frac{-3}{7}x+\frac{27}{7}-11 \\ y=\frac{-3}{7}x-\frac{50}{7} \end{gathered}$

3 0

1 year ago