To solve this, you substitute -5 everywhere you see x so the expression would be...
- (-5)^2 + .5(-5) - 5 ----> Simplify with order or operations
P arenthesis
E xponents
M ultiplication
D ivision
A ddition
S ubtraction
- (25) - 2.5 - 5
-25 - 2.5 - 5
-32.5