Click here to purchase the entire book in PDF format. Distributive Laws This law says that, when you're multiplying a number by the sum of two other numbers, it's the same as adding the results of multiplying the numbers one at a time. For example, 2 * (3 + 4) = (2 * 3) + (2 * 4). In the case of complex math: $$(a + jb) * ((c + jd) + (e + jf)) = ((a + jb) * (c + jd)) + ((a + jb) * (e + jf))$$ (2.38)