need an explanation? - step one : for the first equation given that x=-10 f(x) =2x-4 if 3x exists in this domain substituting x in the equation we have f(-10)=2(-10)-4 f(-10)= -20-4 f(-10)=-24
step two : for the second equation given that x=-10 f(x) =x²-+3 if 10<=x<13 x does not exist in this domain
