All categories

3 years ago

Which of the following is a solution of x2-2x=-8

Mathematics

1 answer:

cupoosta [38]3 years ago

4 0

The last one
You’re completing the square here so you have to find (1/2b)^2. In this case it’s 1. So you have to add 1 to both sides. Then you have to solve for it
It becomes
(x-1)^2 = -7
Then you have to find the square root
(x-1) = √-7
x-1 = √7 √-1
x-1= ± i √7
x= 1 ±i √7
That’s your answer and d is the only one that matches with it

You might be interested in

Y=arccos(1/x) Please help me do them all! I don’t know derivatives :(

Stells [14]

Answer:

$f(x) = {sec}^{ - 1} x \\ let \: y = {sec}^{ - 1} x \rightarrow \: x = sec \: y\\ \frac{dx}{dx} = \frac{d(sec \: y)}{dx} \\ 1 = \frac{d(sec \: y)}{dx} \times \frac{dy}{dy} \\ 1 = \frac{d(sec \: y)}{dy} \times \frac{dy}{dx} \\1 = tan \: y.sec \: y. \frac{dy}{dx} \\ \frac{dy}{dx} = \frac{1}{tan \: y.sec \: y} \\ \frac{dy}{dx} = \frac{1}{ \sqrt{( {sec}^{2} \: y - 1}) .sec \: y} \\ \frac{dy}{dx} = \frac{1}{ |x | \sqrt{ {x }^{2} - 1} } \\ \therefore \frac{d( {sec}^{ - 1}x) }{dx} = \frac{1}{ |x | \sqrt{ {x }^{2} - 1} } \\ \frac{d( {sec}^{ - 1}5x) }{dx} = \frac{1}{ |5x | \sqrt{25 {x }^{2} - 1} }\\\\y=arccos(\frac{1}{x})\Rightarrow cosy=\frac{1}{x}\\x=secy\Rightarrow y=arcsecx\\\therefore \frac{d( {sec}^{ - 1}x) }{dx} = \frac{1}{ |x | \sqrt{ {x }^{2} - 1} }$

4 0

2 years ago

HELP PLS!!!!! What is 1+1

GREYUIT [131]

Answer:

1+1=2 i think

Step-by-step explanation:

3 0

2 years ago

Read 2 more answers

Is 0.78 a rattional number

ipn [44]

Answer:

Yes

Step-by-step explanation:

A rational number can be expressed as a quotient of two integers. Therefore 78/10 = 39/5 = 0.78 represents a rational number between 7.7 and 7.9. Answer: 39/5

8 0

2 years ago

Read 2 more answers

(2²)(3²) someone please help

Vaselesa [24]

4x9=36your answer is 36

Reason:2squared is 2x2 =4

Reason:3squared is 3x3=9

When you square a number you are multiplying it by itself

3 0

2 years ago

PLS HELP WITH THE QUESTION IN THE PICTURE!!!

Ksivusya [100]

Answer:

Step-by-step explanation:

Interesting question. The wording is a bit awkward. I think you have to assume the base is a square and each succeeding base is also a square.

So the first thing to do is to add the bases together.

30*30 + 23*23 + 16*16 + 9*9

Don't add these -- not yet.

Now take the height into consideration

6 *(30*30 + 23*23 + 16*16 + 9*9)

The point is that you only have to multiply by 6 once.

6*(900 + 529 + 256 + 81)

6*(1766)

10596 cubic inches

The answer is D

5 0

2 years ago

Which of the following is a solution of x2-2x=-8​

Which of the following is a solution of x2-2x=-8