Question

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

• A.
• B.
• C. x²-4
• D.
• E.

Answer 1

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