Find the inverse of the quadratic function f. f(x) = x² - 2x , x ≥ 1

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x²-4

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Solution

The correct option is D
Using the technique for inverse function at x=1, f(x) = -1

Replace x by f(x) in the answer options and

Look for an answer options where x= -1, & f(x)=1

Answer is option (d)

2nd method: - Let y = x² - 2x

x² - 2x - y = 0

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