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REY [17]
2 years ago
9

What is the answer to the question?

Mathematics
1 answer:
elena-14-01-66 [18.8K]2 years ago
5 0

Answer:

See attached file for answers and explanation.

Step-by-step explanation:

See attached image.

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(2x + y)2 – (3x – 2y)2 + (x – 4y)(x + 4y<br>11​
Vinvika [58]

Answer:

Step-by-step explanation:

(a+ b)² = a² +  b² + 2ab

(2x + y)² = (2x)² + y² + 2*2x *y

             = 4x²  + y² + 4xy

(a- b)² = a² + b² - 2ab

(3x - 2y)² = (3x)² + (2y)² - 2*3x *2y

              = 9x² + 4y² - 12xy

(a - b)(a +b) = a² - b²

(x - 4y(x + 4y) = x² - (4y)²

                     = x² - 16y²

(2x + y)² - (3x - 2y)² + (x - 4y)(x +4y)

  = 4x²  + y² + 4xy - (9x² + 4y² - 12xy) + x² - 16y²

  = 4x²  + y² + 4xy - 9x² - 4y² + 12xy + x² - 16y²

  = 4x² - 9x² + x²  + y² - 4y² - 16y²+ 4xy + 12xy

 =    -4x² - 19y² + 16xy

8 0
2 years ago
You earn a 90% on his science test you answer 18 questions correctly how many questions were on the test
Bogdan [553]
Hello there!

The correct answer is 20.

Hope This Helps You!
Good Luck :)
8 0
2 years ago
Read 2 more answers
30 points Select the expression that has a sum of seventy four hundredths.
qwelly [4]

Answer:

A, If you still need help

4 0
2 years ago
16. Two years of local phone service costs $883, including
Evgen [1.6K]

Answer:

The monthly fee would be $23

Step-by-step explanation:

hope it helps mark as brainllest if help!!!

3 0
2 years ago
Can you add a negative and positive fraction or do you have to subtract it?
KengaRu [80]

Answer:

Hi

Step-by-step explanation:

You have to subtract it because you add a negative and positive fraction together you can add a positive with a positive or vice versa but you can add n and p together so you have to subtract.

Hope it helps

6 0
2 years ago
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