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Inverse function of limited quadratic equation.

F(x) = 2x^2 - 8x, where x = or > 2

Even though I know that this particular quadratic equation does have an inverse since the domain is limited, I don't know how to figure out the formula for the inverse for a quadratic equation. I don't know how to solve for x, since there are two different x's.

Thank you!

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The inverse function of a limited quadratic equation is found. The solution is detailed and well presented. The response received a rating of "5/5" from the student who originally posted the question.