If the discriminant of the equation  6x 2  - bx + 2= 0 is 1,then the value of 'b' is:
A 7                       (B) -7                             (C) ±7                         (D) ±7

Dear student
The given quadratic equation is, 
6x - bx + 2 = 0
We have , A = 6  ;  B = - b  ;  C = 2
Discriminant, D = B2 - 4AC = (- b)- 4(6) (2) = b2 - 48
But, D = 1
so, b2 - 48 = 1
   b= 49
   b = +7 or -7  
Regards

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