Given function f, prove that f(x)=4-2x is a one -to-one function.
A one-to-one function is a function for which every element of the range of the function corresponds to exactly one element of the domain.
f(x) = 4 - 2x
We have to show that
if f(x1)=f(x2), then x1=x2
Happy to help :)
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