Solve the following equation by completing the square.
1. 5x^2 +2 =12 (Type an exact answer, using radicals as needed. Use integers or fractions for any numbers in the expression. Use a comma to separate answers as needed. Simplify your answer.)
2. 5x^2 - 5x -1 = 0 Compute the discriminant. Then determine the number and type of solutions of the given equation. What is the discriminant?
3. x^2-2x-3=0 Solve the absolute value equation or indicate that the equation has no solution. Note: There is either no solution set or a solution set that may use commas to separate answers. |x| = 2