Answers

2016-04-14T20:38:19+05:30
(i) let f(x) = 0
     x²-3x-4= 0
     x²-4x+x-4=0
     x(x-4)+1(x-4)=0
     therefore, x = 4 , -1
(ii)let,
   f(x) = 0
   (4-x²) =0
   (2+x)(2-x) =0
   x = 2 , -2
(iii) let, f(x) = 0
     x²=0
     x = 0
        
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