Question

8u+2(u-10)=0

Answer 1

distribute and then solve for u:
\[8u+2u-20=0\]\[10u-20=0\]\[10u=20\]\[u=2\]

hope this helps! :)

Answer 2

Distribute the 2.
8u+2u-20=0
Add the u's.
10u-20=0
Add 20 to both sides.
10u=20
Divide both sides by 10.
u=2