Apply aᵐ × aⁿ = aᵐ⁺ⁿ to terms with coefficients, e.g. 4a³ × 3a² = 12a⁵, including two letters like 2a²b × 3ab³. Positive integer indices only; negative and fractional indices are Number-strand work, the fractional ones Higher there. Both tiers — the laws are applied here, derived on Number. (A4)