how do I solve f(x)= X2 - 2x - 35

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You solve by factoring. So when you factor you get f(x) =  (x+5) (x-7) now you set x+5 and x+7 equal to zero in order to solve for x So:       x+5= 0                           x-7 =0              -5   -5                             +7  +7             x= -5                               x= 7