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3 years ago

Help help help help helph helph epl

Mathematics

1 answer:

Jlenok [28]3 years ago

7 0

A: 7.2

B: 14.1

C: 9.5

D: 3.7

E: 8.1

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Help me pls!!!!!!!!!

Dominik [7]

Answer:

$x^2+18=-9x : x = -3, x = -6$

Step-by-step explanation:

$x^2+18=-9x$

Add 9x to both sides:

$x^2+18+9x=-9x+9x$

Simplify:

$x^2+9x+18=0$

Solve with the quadratic formula:

For a quadratic equation of the form $ax^2+bx+c=0$ the solutions are:

$x_{1,\:2}=\frac{-b\pm \sqrt{b^2-4ac}}{2a}$

For $a=1,\:b=9,\:c=18:\quad x_{1,\:2}=\frac{-9\pm \sqrt{9^2-4\cdot \:1\cdot \:18}}{2\cdot \:1}$

$x =\frac{-9 + \sqrt{9^2-4\cdot \:1\cdot \:18}}{2\cdot \:1} : -3$

$x =\frac{-9 - \sqrt{9^2-4\cdot \:1\cdot \:18}}{2\cdot \:1} : -6$

The solution to the quadratic equation are:

$x=-3,\:x=-6$

Hope I helped. If so, may I get brainliest and a thanks?

Thank you, have a good day!

6 0

3 years ago

PLEASE HELP, IM BEING TIMED!

Svetlanka [38]

Answer:

Option A is correct .

Step-by-step explanation:

if in a question it is given that BC is equal to AB then only we can do like that...

3 0

3 years ago

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A cylindrical well is 15 meters deep and has a diameter of 1.6 meters. Approximately how many cubic meters of soil were dug out

REY [17]

Answer:30.144 cube meter

7 0

3 years ago

Evaluate 2.625-(-6)

Lunna [17]

2,625 - (-6) =

= 2, 625 + 6

= 8, 625

8 0

3 years ago

Using the change-of-base formula, which of the following is equivalent to the

Otrada [13]

Given:

The logarithmic expression is:

$\log_718$

To find:

The equivalent expression of given expression by using change-of-base formula.

Solution:

The change-of-base formula is:

$\log_ba=\dfrac{\log_ca}{\log_cb}$

The given expression is:

$\log_718$

Using the change-of-base formula, we get

$\log_718=\dfrac{\log_c18}{\log_c7}$

Where, is a constant and c>0.

Let $c=10$ , then

$\log_718=\dfrac{\log_{10}18}{\log_{10}7}$

Therefore, the correct option is a.

3 0

2 years ago