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Question

Discriminant of the equation ax2+bx+c=0 is given by
  1. b2+4c
  2. b24c
  3. b24ac
  4. b2+4ac


Solution

The correct option is C b24ac
For equation ax2+bx+c=0, expression b24ac is called discriminant and is denoted by D.

If D>0, then the equation has real and unequal roots.
If D=0, then the equation has real and equal roots.
If D<0, then the equation has imaginary and unequal roots.

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