A root canal (drilling into the root of a tooth to kill the nerves) can be fairly painful even WITH anesthetics; without them (and Novocaine is a commonly-used drug in dental surgery) it would be excruciating.
So the phrase means "very painful".
82
91
8
a minus take away a minus makes a minus
A minus plus a minus is not necessarily positive. A minus multiplied by a minus is. The reason being that the minus of a minus is a positive. It's a double negative.
A minus by a minus by a positive gives a positive.
A bigger minus.
-17
Yes it does. A minus is the opposite of something, so the minus of a minus is a plus.
Because both minus signs to be cut therefore minus * minus will be treated as plus numbers
987654193
The answer is -8