ELI5: Why is - 1 X - 1 = 1 ? : r/explainlikeimfive

The way I prefer is to think of a negative number as "the opposite of" it's corresponding positive number. So -2 would be "the opposite of two", -12 would be " ...

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Everyone knows that -1 x -1 = 1. How do we know that? Because one of the rules of arithmetic that we all learned early in our mathematical education.

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So this means that -1 * -1 is the additive inverse of -1. We know that 1 + (-1) = 0 so 1 is the additive inverse of -1. Hence -1 * -1 = 1.

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Multiplication by ONE is simple. Any number multiplied by ONE is itself! Fish Shop game UI snippet - 9x0 fact. Fact Navigator. You're learning. 1. x 1. 1. 1.

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In elementary algebra, the binomial theorem (or binomial expansion) describes the algebraic expansion of powers of a binomial. According to the theorem, ...

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Is there a formal proof for (−1)×(−1)=1? It's a fundamental formula not only in arithmetic but also in the whole of math. Is there a proof for it or is it just ...

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An easy method for solving 1.1 * 1.1 would be to break apart one of the factors into its digits with respect to its place value, multiplying them separately.

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If what you wanted is a proof for: ∀x,x=−x ∀ x , x = − x then let x=1 and thus since 1≠−1 1 ≠ − 1 x=-x is disproven by counterexample.

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