Question

which is the solution set of 6x^2-24=0
○(-2,2)
○(-2)
○(2)

Answer 1

Rewrite  6x^2-24=0  as 6(x^2-4)= 0 and then factor x^2-4:

6(x-2)(x+2)= 0.  The solutions are {-2,2}.