Which functions are invertible? Select each correct answer.

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1 Answer
Daniel L.
Dec 10, 2017

They are #A# and #D#. See explanation.

Explanation:

A function is invertible if and only if it takes each value only once. This is true for #A# and #D#.

For other functions this statement is false.

For example function in #C# takes #0# for #x_1=-4# and #x_2=4#.

Function #B# also has 2 zeros. They are #0# and #3#.

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