For what value and is n minus one plus one equal to zero? Okay, so they're telling us what is the absolute value, which are these vertical lines here of n minus one plus one equal to zero. So when for what value n? Do we make this equation equal to zero? Okay, so this is just solving like you would any other normal equation. So we subtract one on both sides, so we get the absolute value of n minus one is equal to negative one.

Okay? Now ask yourself what value of n would give me a negative one? Well, the issue here is that absolute value of anything regardless of what is going on inside of it will always be positive. But the answer here is negative one, so there is no value for it.