Sum of root for 1 x ^ 2 - 9x = 36

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.

In the geometric progression –3, 12, −48… what term is 3,072?

Can someone, me with this.i really need with this