When any part of an expression is inserted within a pair of brackets with a negative sign before it, the sign of each term inside the brackets remains unchanged.
False
When any part of an expression is inserted within a pair of brackets with a negative sign before it, the sign of each term inside the brackets changes.
For example, a−b+c−d can be written as a−(b−c+d) or a−b−(−c+d).