Dear forum members,
I have two equations to solve
NOTE! PLEASE PRETEND THE PARENTHESES ARE ABSOLUTE VALUE BARS.
I know how to solve them, but there is something in my teacher's answers which baffles me.
for b) she wrote x=-5 or X=-7 and for c) =-7 and x=5
Why use or in b and then and in c?
Could someone please explain?
Thank you in advance!