If $$ h(x) = 6x^3 - 2x^2 + 4x - 1 $$ and $$ k(x) = -x^3 + 3x...

Question Analysis
This question tests the student's ability to add two cubic functions and simplify the result.

Key Concept Explanation
When adding functions, combine like terms. The resulting function will be a new function with the same input variable.

Step-by-step Solution
1. Start with the given functions: and
2. Add the functions: