Question

Why is -1=-1 in multiplicative inverse

Answer 1

In mathematics, a multiplicative inverse or reciprocal for a number x, denoted by 1/x is a number which when multiplied by x yields the multiplicative identity, 1


Ie, number*multiplicative inverse(number)=1

Multiplicative inverse (-1)=1/X=1/-1=-1

To check it (X* mul inverse(X)=1)
-1*-1=1
Hence it occurs