Follow the process of completing the square to solve x^2 = -4x + 3. Which of the following equations is used in this process?
(2x + 4)^2 = 12
(2x + 4)^2 = 19
(2x + 4)^2 = 28

Which answer is the solution set to the inequality |x|< 9? a. x< -9 or x> 9 b. x> -9 and x< 9 c. x> -9 or x< 9 d. x< 9 and x< 9

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?

Could somebody me with this radical simplification?