In the Previous Three Problems, the Values Of $u _ { i , - 1 }$

Multiple Choice

In the previous three problems, the values of $u _ { i , - 1 }$ are

A) $u _ { i , - 1 } = u _ { i , 0 } - k g ( x i )$
B) $u _ { i , - 1 } = u _ { i , 0 } - 2 k g ( x i )$
C) $u _ { i , - 1 } = u _ { i , 1 } + 2 k g ( x i )$
D) $u _ { i , - 1 } = u _ { i , 1 } + k g ( x i )$
E) $u _ { i , - 1 } = u _ { i , 1 } - 2 k g ( x i )$