Hi,         

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.

Graphically one can use the horizontal line test to check for one-to-one

f(x)=2x^2+3x-5  this function is not a one-to-one function

   2 different values of x will result in the same y value.

 

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