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kirill115 [55]
3 years ago
8

Which is the correct reason why (x+y)^2 is not equal to x^2+y^2

Mathematics
1 answer:
Elina [12.6K]3 years ago
4 0

Answer:

Step-by-step explanation:

It would be easier to just show you.

Because we're using variables, I'm going to plug in a random set of numbers to stand for x and y.

(x+y)^2

(2+4)^2=36

vs.

x^2+y^2

2^2+4^2=20

The difference is because, following the order of operations, in the first situation you must first take care of what is in the parenthesis, which means you add x and y together-then you multiply that combined number by the 2nd power. Whereas in the second situation, you multiply x and y by the 2nd power separately, and then add the product of that together. So opposite order. In the first situation you add, then multiply. In the second, you multiply then add.

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Step-by-step explanation:

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No wonder you asked for help. Some of the questions don't make sense!

x+3 = 9 ⇒ x=6, which doesn't match either A or B.

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9 = 3·x is the same as the previous equation, i.e., B.

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The number of boats are 8; so, he needs a total of 8*126 gallons.

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