Answer:
[tex]12m[/tex]
Step-by-step explanation:
If we have the expression [tex](4m-5)-(-8m-5)[/tex], we need to distribute. This is the same as [tex]1(4m - 5) -1(8m -5)[/tex]
[tex]4m - 5 \cdot 1 = 4m - 5[/tex], so we can leave that be. However, we now need to multiply [tex]-8m-5[/tex] by -1. Doing so gets us [tex]8m + 5[/tex].
Together, we get [tex]4m - 5 + 8m + 5[/tex]. Combining like terms, we have [tex]12m - 5 + 5 = 12m[/tex].
Hope this helped!
