Question

The simplified form of an expression is 1 . Which expression was simplified?

Answer 1

2-1, 3-2, 4-3, 1*1, 1/7, any number of expressions fit the bill here.

Answer 2

`a*a^(-1)=a*(1)/(a)= (a)/(a)=1 \\\\a\in R`

Explanation:

We are talking about the multiplicative inverse of any number. The multiplicative inverse of a number is another number that multiplied by the first, results in the neutral element of the product, that is, the unit. If we have a real number
`a`, then its multiplicative inverse is denoted by
`a^(-1)`, and it is true that:

`a*a^(-1)=a*(1)/(a)= (a)/(a)=1 \\\\a\in R`

It's important to note that the multiplicative inverse exists in rational numbers, in real numbers, and in complex numbers.