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Mathematics
81828:

i need help Which function has an inverse that is also a function? g(x) = 2x – 3 k(x) = –9x2 f(x) = |x + 2| w(x) = –20

Echofire:

To find an inverse of a function, switch the variables and solve in terms of x. Remember, the inverse function has to pass the vertical line test. The last option is a constant so it has no inverse and the 3rd option can be ruled out because absolute value functions do not have an inverse. I assume the k(x) function is -9x^2. Find and graph the inverse of the remaining functions and you will find the answer and see why it makes sense that it is the answer.

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