# maths complex numbers

posted by
**Jake** on
.

Can abs(28-7w)=7abs(w)

be written as abs(w-4)=abs(w)

and if so why surely it should be

abs(4-w)=abs(w)

can any one explain why I can just chane the signs

Yes, it can be written that way.

I don't see that you have changed any signs, you factored a postive seven out of both sides, and divided it out.

Thanks