To multiply the polynomial \((b + 8)(3b - 6)\), we can use the distributive property (also known as the FOIL method for binomials):
\[ (b + 8)(3b - 6) = b \cdot 3b + b \cdot (-6) + 8 \cdot 3b + 8 \cdot (-6) \]
Now, calculate each term:
- \(b \cdot 3b = 3b^2\)
- \(b \cdot (-6) = -6b\)
- \(8 \cdot 3b = 24b\)
- \(8 \cdot (-6) = -48\)
Combine these results:
\[ 3b^2 - 6b + 24b - 48 \]
Now combine like terms:
\[ 3b^2 + (24b - 6b) - 48 = 3b^2 + 18b - 48 \]
So, the simplified result is:
\[ \boxed{3b^2 + 18b - 48} \]