I am confused on how to solve this question to find the zeros.

We don't really need the Q Formula....but...here goes, anyway

x^2   = 115

x^2  - 115 =0 

x^2 +0x -115  = 0          a = 1 , b = 0    c  = --115

So we have

x  =         -0  ±√ [0^2 - 4 (1) (-115)]                  ±√[ (4 (115) ]         ± 2√115

               ____________________   =          ___________  =    ________ =    ±√115

                      2(1)                                                2                            2

[ An easier way would be to use the square root property directly to solve the first equation ]