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Why doesn't every real number have a multiplicative inverse?
The only real (or complex) number which does not have a multiplicative inverse is 0. There is nothing you can multiply by 0 to get 1.
How do you prove the multiplicative inverse of a real number is unique?
Suppose p and q are inverses of a number x. where x is non-zero. Then, by definition, xp = 1 = xq therefore xp - xq = 0 and, by the distributive property of multiplication over subtraction, x*(p - q) = 0 Then, since x is non-zero, (p - q) = 0. That is, p = q. [If x = 0 then it does not have a multiplicative inverse.]
Why can't you divide 100 by zero?
Because zero has no multiplicative inverse (no real number multiplied by 0 produces 1).
What are some real life examples of multiplicative inverse?
Here is one example of a practical use of multiplicative inverses. If you want to convert from feet to meters, you multiply by 0.3048. If you want to convert the other way round, you either DIVIDE by the same number, or you MULTIPLY by its multiplicative inverse. The same applies to many similar conversions.
How is the additive inverse property related to the additive identity property?
They have no real relations ofther than being mathmatical properties The additive identity states that any number + 0 is still that number; a+0 = a The additive inverse property states that any number added to its inverse/opposite is zero; a + -a = 0
