How can you prove (-1) x(-1) =1?

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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A good explanation of why -1 x -1 = +1 please : r/askmath

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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Why Does -1 x -1 = 1?

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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Meet the Math Facts Multiplication & Division - 1 x 1 =1 ...

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

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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Understand the basics for 1 x 1 = 1

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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Binomial theorem

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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Formal proof for $(-1) \times (-1) = 1

$Formal proof for $(-1) \times (-1) = 1$

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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