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2. (x + 5) (x + 4) = x^2 + 4x + 5x + 20 = x^2 + 9x + 20
1. (15k^3)^2 = 15 x 15 x k^3x2 = 225k^6
2. (15m^6 x n^8 / 3m^3 x n^2)^3 = (5m^3 x n^6)^3 = 125m^9 x n^18
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