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Which functions are invertible? Select each correct answer.

1 Answer

Dec 10, 2017

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

Explanation:

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

For other functions this statement is false.

For example function in $C$ $C$ takes $0$ $0$ for $x_{1} = - 4$ $x_1=-4$ and $x_{2} = 4$ $x_2=4$ .

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

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