The equation $x^3 + 8x^2 - 4x + c = 0$ has three roots, one of which is the sum of the other two. What is $c$?
Question:
The equation $x^3 + 8x^2 - 4x + c = 0$ has three roots, one of which is the sum of the other two. What is $c$?
Answer:
Let's think step by step.

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The equation $x^3 + 8x^2 - 4x + c = 0$ has three roots, one of which is the sum of the other two. What is $c$?
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