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Expansion of $$(a-x)^n$$
## Formula
$$(a-x)^n=\sum_{r=0}^{n}(-1)^r{}^nC_ra^{n-r}x^r$$
## Usage
- Used when the second term of the binomial is negative.
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Expansion of $$(a-x)^n$$
## Formula
$$(a-x)^n=\sum_{r=0}^{n}(-1)^r{}^nC_ra^{n-r}x^r$$
## Usage
- Used when the second term of the binomial is negative.
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