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Anestetic [448]
3 years ago
8

Ur answer will be marked as brainliest

Mathematics
1 answer:
Mars2501 [29]3 years ago
7 0

Answer:

Hi there!

The correct answer is: 2x^{2} + y^{2} + z^{2}  - 2\sqrt{2} xy - 2\sqrt{2} xz + 2yz

Step-by-step explanation:

First of all I want to clarify I used to the fourth identity to solve this problem.

The fourth identity is: (x+y+z)^{2}  = x^{2}  + y^{2} + z^{2} + 2xy + 2xz + 2yz

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Which of the following correctly completes the square for the equation
rjkz [21]

Answer:

A. (x + 2)^2 = 31.

Step-by-step explanation:

x^2 + 4x = 27

x^2 + 4x - 27 = 0

A. (x + 2)^2 = 31

x^2 + 4x + 4 - 31 = 0

x^2 + 4x - 27 = 0

This option corresponds to the given equation, so it is correct.

B. (x + 2)^2 = 43

x^2 + 4x + 4 - 43 = 0

x^2 + 4x - 39 = 0

This does not correspond to the equation.

C. (x + 4)^2 = 31

x^2 + 8x + 16 - 31 = 0

x^2 + 8x - 15 = 0

This does not correspond to the equation.

D. (x+4)^2 = 43

x^2 + 8x + 16 - 43 = 0

x^2 + 8x - 27 = 0

This does not correspond to the equation.

So, your answer is A. (x + 2)^2 = 31.

Make sure to SUBMIT and check your PREVIOUS answers to make sure they are right! XD Also, hope this helps!

7 0
3 years ago
Posting a screenshot.
Anna71 [15]
Since 6 is positive, it's (x+blank)^2

6/2=3, and (x+3)^2 = x^2+6x+9. We have x^2+6x-2, so we have to add 9 to both sides to get (x+3)^2-2=9, then subtract 9 from both sides to get
(x+3)^2-11=0, or (x+3)^2=11. Square root both sides to get x+3=sqrt(11), and x=sqrt(11)-3, which is approximately 0.32
8 0
3 years ago
6 sweets cost 42p altogether how much do 8 sweets cost
Eddi Din [679]
The best thing to do is to find the cost of one sweet, and to do this, divide 42 by 7.
42/7= 6
Therefore, one sweet costs 6p.
To find the cost of 8 sweets, you've got to multiply 6 by 8, and this gives you 54p.
Therefore, 8 sweets cost 54p
This is basically just finding unit rate and multiplying.
<span>Hope this helps :)</span>
8 0
3 years ago
Read 2 more answers
Can you help me find the B plzzz
UNO [17]

Answer:

B=80

Step-by-step explanation:

B is the same answer as the number on the other side

8 0
3 years ago
Read 2 more answers
Solve each inequality <br> 2v&gt;10
34kurt
Hey there 

Solution

1) <span>Divide each side by</span> 2 
<span>v > </span>\frac{10}{2}

2) Simplify \frac{10}{2} to 5
<span>v>5

Answer -- </span>v><span>5</span>
4 0
3 years ago
Read 2 more answers
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