SOLUTION: what is the inverse of f(n)= -1-2n^3

Question 996944: what is the inverse of f(n)= -1-2n^3
Found 2 solutions by MathLover1, stanbon:
Answer by MathLover1(20849) (Show Source): You can put this solution on YOUR website!

to find the inverse of , first recall that
so, we have -> now swap and

...solve for

->your inverse

or

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
what is the inverse of f(n)= -1-2n^3
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1st:: Interchange x and y to get:
x = -1 - 2y^2
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2nd: Solve for "y"::
2y^2 = -1-x
----
y^2 = -(x+1)/2
----
y = +/-sqrt[-(x+1)/2]
------------------------
That is the inverse.
Cheers,
Stan H.
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