The distributive law says that:

a(b + c) = ab + ac

Example 1:

2x(4x - 1) = 8x^{2} - 2x

Example 2:

5x -x(4x - 1) = 5x - 1x(4x - 1) = 5x - 4x^{2} + 1x = -4x^{2} + 6x

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