What are the key aspects of the graph of f(x) = x^2 – b^2, where b is a real number?

Ineed to know the answer to this algebra question.

What is the factored form of the following expressions? d^2 – 13d + 36

Match the following reasons with the statements given to create the proof. 1. do = ob, ao = oc sas 2. doc = aob given 3. triangle cod congruent to triangle aob vertical angles are equal. 4. 1 = 2, ab = dc if two sides = and ||, then a parallelogram. 5. ab||dc if alternate interior angles =, then lines parallel. 6. abcd is a parallelogram cpcte