please help me don't post irrevalent answers
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A is the correct answer!!
Step-by-step explanation:
f(x) = 2x
f(x1) = f(x2)
2x1 = 2x2
x1 = x2
∴ it is one - one
let y = 2x ⇒ x = y/2
f(x) = y
Now put in f(x)
f(x) = 2(y/2) = y
∵ it is onto
It means f(x) = 2x is bijective
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