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Someone please help with these 2 questions.

Q. Find inverse of the following functions (solve for x)
i) y = (x^3+5)/(x-3)
ii) y = (x^3-8)/(x^2-4)

Micky Arya , 16 Years ago
Grade
anser 1 Answers
Jitender Singh
Ans:
(ii)
f(x) = \frac{x^{3}-8}{x^{2}-4}
f(f^{-1}(x)) = \frac{(f^{-1}(x))^{3}-8}{(f^{-1}(x))^{2}-4}
(f^{-1}(x))^{3}-x(f^{-1}(x))^{2}+4x-8=0
f^{-1}(x) = \frac{x-2}{2}\pm \frac{1}{2}\sqrt{x^{2}+4x-12}
Inverse of (i) can not be find in terms of standard mathematical functions.
Thanks & Regards
Jitender Singh
IIT Delhi
askIITians Faculty
Last Activity: 11 Years ago
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