Sub-Sūtra 12 of 13
Samuccayaguṇitaḥ
The sum of the products
Sum-of-products check for factorisations.
When to use
Verifying complex products.
How it works
Sum of all pair-products equals expected coefficient.
Memory formula
When sums multiply cleanly, use that combined sum as the check.
Worked examples
Problem 1
Verify (x+1)(x+2)(x+3) = x³ + 6x² + 11x + 6
0/3
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