I need the area for this somebody help

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

X2 + y 2 = 36 x + y = 6 solve the system of equations.

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.