What is the solution set of x^2 + 5x + 1 = 0?

Pls , the question is in the picture!

In the following diagram it is given that dec,ab || dc, ad || eb, and ad is congruent to bc. a)why isn't abc a parallelogram even though it has a pair of parallel sides and a pair of congruent sides b)explain why be must be congruent to bc. further explain what type of triangle this makes triangle abc and what it tells you about angle 1 and angle 2c) finally why must angle 3 be congruent to angle 1? further, explain why we know that angle 3 is congruent to angle 2

Rewrite the following quadratic functions in intercept or factored form. show your work. f(x) = 3x^2 - 12