f(x) = -2x.....the range is ur f(x) values while the domain is ur x values
so when the domain is -1....sub in -1 for x and find the range f(x)
f(x) = -2(-1)
f(x) = 2.....so the range is 2
when the domain is 0...so sub in 0 for x and find the range f(x)
f(x) = -2(0)
f(x) = 0...so the range is 0
when the domain is 2.....sub in 2 for x
f(x) = -2(2)
f(x) = -4...and the range is -4
so ur range values are { 2,0,-4 } <====
