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f(-1) = 2(-1) - 5
= -2 - 5
= -7
f(1) = 2(1) - 5
= 2 - 5
= -3
f(3) = 2(3) - 5
= 6 - 5
= 1
f(5) = 2(5) - 5
= 10 - 5
= 5
a) Range = {-7,-3,1,5}
b) {(-1,-7),(1,-3),(3,1),(5,5)}