How do you multiply (9z-u)(7z+4u)?

Apr 6, 2015

Using the distributive property with FOIL:
(9z−u)(7z+4u)
$63 {z}^{2} - 7 u z + 36 u z - 4 {u}^{2}$
$63 {z}^{2} + 29 u z - 4 {u}^{2}$