Question

additive inverse of
58

Answer 1

The additive inverse of a number is equivalent to that number multiplied by negative 1. (This isn't exactly how additive inverse is defined; nonetheless, be assured that following this method will result in an accurate solution/answer)

TIP: Just change the sign before the number.

For better understanding and clarification, 
let a number be $x$.
 ∴ additive inverse of  $x$   =  $-x$.

Therefore, the additive inverse of 58 is -58   (ans.)

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Answer 2

Additive inverse of a (real) number in a group of numbers is defined as that number which when added to it results in the additive identity.

In our number system the additive identity is:  0

so for   any number x ,         x + (-x) = 0
Hence     additive inverse for x is  -x. 
Thus for  58 ,  the additive inverse is  -58.