After retagging two questions, quadratic-equation (10q) is now ripe for merging with algebra-precalculus. Edit: As pointed out by zyx, quadratics already exists. Probably better to merge it into that one (or perhaps merge both into quadratic-equations, but not every question about quadratics inv...

We have two tags quadratics and quadratic-equation. I think they be synonyms? (I do not have sufficient reputation in either of the two for suggesting a synonym.) The tag-wiki of the first one specifically says that it is for questions about quadratic equations. The second one has empty tag-wiki...