Pre-Calc homework question, Please Help!?

Dash12

New member
Let f(x)=3x^3-18x

a. Solve the equation f(x)=0 by completing the square

b. Find a domain on which f(x) is one-to-one

c. Find the inverse of f(x) on the domain from part (b). Hint: rewrite f(x) in an equivalent form that has no linear term.
 
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