Question

Which function has an inverse that is not a function?

f(x) = x^2

f(x) = 2x

f(x) = x + 2

f(x) = √x

Answer 1

A) f(x)=x^2

Explanation:

did it on i-ready

Answer 2

your choice is correct

Explanation:

f(x) = x^2 does not pass the horizontal line test (a horizontal line intersects its graph in two places), so its inverse does not pass the vertical line test. The inverse is not a function.

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Comment on the graph

The original function f(x)=x^2 is shown by the red curve. Its reflection across the orange dashed line y=x gives the inverse relation, in blue. The black horizontal and vertical lines show the multiple points of intersection with the curves, indicating the inverse relation is not a function.