Answer:
f(x)
= |x|
Let
x1 = 1 and x2 = ? 1 be two real numbers
f(x1)
= f(1) = |1| = 1;
f(x2)
= f(-1) = |-1| = 1
Also,
let y = ? 1
which
is not possible as |x| is always positive.
is not onto.
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