Question

What is the absolute value of -a?

Answer 1

The absolute value of `(-a)` is
`{ (a " if " a>=0), (-a " if " a<0) :}`

For example

If `a = -7` then `abs(-a) = abs(- (-7)) = abs(7) = 7 (=-a)`

If `a= +4` then `abs(-a) = abs(-4) = 4 (=a)`