How to solve 2x^2 - 4x = 3

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?

Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5

Asandwich shop has 18 tables. each table seats up to 4 people. to find the greatest number of people that can be seated, you can solve p4 ≤ 18. which step is the best way to solve the inequality? plz asap i repeat plz