85 points what is the equation of the graph? y = x + 1 y = x y=x−1 y = 2x

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.

What signals you that factoring by grouping is the best method to use when factoring a problem?

Ineed to know the answer right now! !