Step-by-step explanation:
Use the FOIL method
w × 6w =
[tex]6 {w}^{2} [/tex]
w × 2z = 2wz
-7z × 6w = -42wz
-7z × 2z =
[tex] - 14 {z}^{2} [/tex]
this simplified equals
[tex]6 {w}^{2} - 40wz - 14 {z}^{2} [/tex]
first term: 6w^2
second term: -40wz
third term: -14z^2