Solve x^2+4x=1 for x by completing the square

Use set builder notation to represent the following set: { -3, -2, -1, 0}

Read the following two statements. then use the law of syllogism to draw a conclusion. if the tv is too loud, then it will give me a headache. if i have a headache, then i will have to rest.

Consider the proof. given: segment ab is parallel to line de. prove: what is the missing statement in step 5?