Can you solve this: 4+4=20, 5+5=30 so how much is 6+6=?

Here, the plus sign is used to denote some random operation, not really addition. In our world, we can see that this operation is adding the square of a number to the number itself. We can verify this

4^2+4=16+4=20
5^2+5=25+5=30
6^2+6=36+6=42
Therefore, 6+6=42

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