Not sure if this is one was supposed to be 83
1 answer:
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You can rewrite your function as
This implies that
Now, we have , so it counts as a solution.
On the other hand, depending on the coefficient a, b and c, the cubic equation
can have either one or three solutions.
So, we have the solution x=0, and then one or three solutions coming from the cubic part. The equation as a whole thus have either two or four solutions, depending on the coefficients.