TDSM 2.17
From The Data Science Design Manual Wikia
[math]b^{(\log_b x + \log_b y)} = b^{\log_b x} \cdot b^{\log_b y} = x \cdot y[/math]
[math]b^{(\log_b x + \log_b y)} = b^{\log_b x} \cdot b^{\log_b y} = x \cdot y[/math]