1.

Consider f : [3, ∞) → [1, ∞) given by f(x) = x2 – 6x + 10. Find f-1

Answer»

f(x) = (x – 3)2 + 1

y = (x – 3)2 + 1

⇒ (x – 3)2 = y – 1

 ⇒ x = \(\sqrt{y-1} + 3\)

∴ f-1(x) = \(\sqrt{x-1} + 3\)



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