How do I solve this Quadratic Equation by Factoring it?

2x^2-11x+5=0

Can someone me with these two circle theorem questions asap?

The coordinates r(1, -3), s(3, -1) t(5, -7) form what type of polygon? a right triangle an acute triangle an equilateral triangle an obtuse triangle

Given the diagram below, michael writes, "segment ac is congruent to segment ac." which of the following reasons allow him to write this statement?