Answer :
Range of a function are the output values of the function:
since the domain is (-3, 0, 4), then we have to substite x with this values:
f(x)=2(-3)-4
f(x)=-6-4
f(x)=-10
f(x)=2(0)-4
f(x)=-4
f(x)=2(4)-4
f(x)=4
Range of the function is (-10, -4, 4)