h(x) = 19-x when x is 5 and when x is -5

Question

I need to write and expression so is this the right way?
h(x)=19
h(5)x19
h(5)x 19=-5

Answer 1

h(5)=19-5
h(-5)=19+5

Answer 2

when x=5, substitute all the x's with 5..
do the same when x=-5

Answer 3

Thank you Rachel I understand much better

Answer 4

you're welcome!