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Domain (D)={2,4,6,8}
Range (R)={-2,0,2,4}
2.f(x)=x D={... -1,0,1,2,3,4} R={...-1,0,1,2,3,4}
3. f(x)=8.2x . D={-3,-2,-1,0,1,2} R={-48,-32,-16,-8,0,16,32}