If u={1,2,310},A={1,2,3,4,5,6,7,8,9},B ={2,3,4,6,8,7} list the element of following set operations Ā

Which of the expressions (on the photo document i inserted) together represent all solutions to the following equation? 8cos(12x)+4=-4 *the answer should be in degrees.* > i would like for someone to explain the process to find the solutions for this.

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. x^2 + 4x + 5 = 0

How do you determine if an ordered pair is a solution to a given equation?