stx stx st1 stx stx st1 Solutionstx sx tx stx sx tx s t

(s-t)(x) =

(s*t)(x)=

(s+t)(1)=

Solution

(s-t)(x)= s(x) - t(x)

(s*t)(x)= s(x) * t(x)

(s + t) (-1) = -s-t