Sum of coefficients via substitution (Plug x=1 into polynomial; alternate signs at x=−1)
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Plug x=1 into polynomial; alternate signs at x=−1
What each symbol means
| Symbol | What it stands for |
|---|---|
| c_k | Coefficient of x^k |
| f(x) | Expanded polynomial |
When to use this
Finite expansion; valid algebraic substitution.