Can someone tell me how I can tell that sqrrt(x+4 = -5 has no solution without solving it?
Ok, I'm not sure, so if I'm wrong, someone please correct me.
We use to represent the principal, positive square root of a number. The negative root is represented by . The two square roots are represented together by .
has no solution because you are referring to the positive root, which obviously can't be -5.