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Liono4ka [1.6K]
3 years ago
11

Help me with equations

Mathematics
1 answer:
iragen [17]3 years ago
5 0
The answer to your question is C.
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Mars2501 [29]

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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Since there is 10% off of the price, the new cost is 90% of the original. So we just multiply the price by 0.9

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find two numbers that have square roots between 7 and 8. one number should have a square root closer to 7 and the other should h
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Step-by-step explanation:

7 = √49

8 = √64

So any positive integer between 50 to 63, both inclusive, have a square root between 7 and 8.

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