If f - R- R and fx - x2 - 5x - 9- then f-19 equals

The correct option is C {0, 5} f^ 1(9) will be the roots of x^2 5x+9 = 9 ⇒ x(x 5)=0 ⇒ x =0, 5 Hence f^ 1(9) = 0,5 ...

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How to Find the Inverse of a Function

If f : R→ R...

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If $f : R \to R$ and $f (x) = x^{2} - 5 x + 9$ , then $f^{- 1} (9)$ equals

{0}

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{5}

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{0, 5}

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none of these

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