The angles are xº, 9X°, (x+4)

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.

The product of two negative rational numbers is always zero sometimes zero never zero

If (x-2) 2= 49, then x could be a. -9 b. -7 c.- 2 d. 5 e.9