Answer:
4 (-1 + 2 x)
Step-by-step explanation:
Simplify the following:
9 x - (x + 4)
-(x + 4) = -x - 4:
9 x + -4 - x
Grouping like terms, 9 x - 4 - x = (9 x - x) - 4:
(9 x - x) - 4
9 x - x = 8 x:
8 x - 4
Factor 4 out of 8 x - 4:
Answer: 4 (-1 + 2 x)
