Answer: It should be 3w - 6y + 3
Step-by-step explanation:
-Solve:

-Use Distributive Property:


-Then, combine like terms:


Result:

Step-by-step explanation:
Explanation is in the attachment
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Answer: The correct answer is Choice C.
For this polynomial to be a perfect square, it would need to be:
(10x + 7)^2
This will ensure that the first terms and the last terms will be 100x^ and 49. However, if you use foil to multiply the factors, you will not get 150x for the center term. Choice C also states that 150x will not be the middle term.
This diagram show the sound wave have a high pitch