Recall that to evaluate an expression at a given value(s), we replace the variable(s) with the given value(s).
Substituting a=-2, and b=-5 in the given expression, we get:
[tex](18-(-2)(-5))+4(-5)\text{.}[/tex]Simplifying the above result, we get:
[tex](18-(10))-20=8-20=-12.[/tex]Answer:
[tex]-12.[/tex]