The answer is simple.
But - ask around, 99% of the answers will be "because that's the rule". Even if you ask people with university degrees.
If people do not bother to ask themselves something as simple as that, because the question did not appear anywhere during school (at least not for me), imagine what other more complex "rules" are taken for granted, and nobody even imagines there should be a question.
And the answer: (-1) x (-1) = -(-1).
The minus sign signifies a subtraction or a "debt". Removing a debt results in a gain.
Why do two negative numbers multiplied give a positive number?
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