What’s an appropriate method to solve 9x^2+3x-2=0? ? factoring quadratic formula completing the square

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

What is x3+3x2−16x−48 divided by x−1?

Rhombus adef is inscribed into a triangle abc so that they share angle a and the vertex e lies on the side bc . what is the length of the side of the rhombus if ab=c, and ac=b.