Question

How i rewrite a subtraction as addition of signed numbers -1-8=

Answer 1

Given the expression:

`\text{ - 1 - 8}`

In the rule of subtracting integers, when a negative integer is being subtracted by a number, that number will be added to the negative integer instead. We get,

`\text{ -1 - 8 }\rightarrow\text{ -1 + (-8) = -9}`

Rules in subtracting integers,

- subtracted by + = - plus the number in negative form = -x - y = - x + (-y)

- subtracted by - = - plus the number positive form = -x - (-y) = - x + y

+ subtracted by + = automatically subtract = x - y

+ subtracted by - = the operation will change into addition = x - (-y) = x + y