For this case we have:
Given [tex]a + b = 0[/tex], we want to find an expression equivalent to [tex]a-b[/tex].
Let the equation [tex]a + b = 0[/tex]be:
Subtract -2b on both sides of the equation:
[tex]a + b-2b = 0-2b[/tex]
Taking into account that different signs are subtracted and the sign of the major is placed:
[tex]a-b = -2b[/tex]
Thus, an expression equivalent to[tex]a-b[/tex] is [tex]-2b[/tex].
Answer:
-2b
