Question 80120
find an equation for its inverse 
f(x)=3x^3-4
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Interchange x and y to get:
x=3y^3-4
Solve for y:
y=[(x+4)/3]^(1/3)
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{{{graph (400,300,-10,10,-10,10,3x^3-4,((x+4)/3)^(1/3))}}}
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Cheers,
Stan H.