Question 61618
You can factor (4ux + 20u + vx + 5v) by grouping as follows:
(4ux + vx) + (20u + 5v) Factor an x from the first group and factor 5 from the second group.
x(4u + v) + 5(4u + v) Factor out the common (4u + v)
(4u + v)(x+ 5)...and you're done!