Question

9 * (2a + b) ^ 2 - 4 * (a - b) ^ 2

Please solve ​

Answer 1

Can you imagine a world without merchants, where we are left to our own devices to acquire goods and services without middlemen? Sounds like a harsh place to be. The sale and trade of goods defines much of the development and history of the world.

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Answer 2

Answer:

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