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  • Need clarity, kindly explain! - Complex numbers and quadratic equations - JEE Main-3

If x^{2}-x+a= 0 has discriminant 49, then a equals

  • Option 1)

    -11

  • Option 2)

    -12

  • Option 3)

    -13

  • Option 4)

    -14

 

Answers (1)

best_answer

49=(-1)^{2}-4(1)(a)\Rightarrow 49=1-4a

4a= -48

a=-12

 

Discriminant of Quadratic Equation -

D=b^{2}-4ac

- wherein

ax^{2}+bx+c= 0

is the quadratic equation

 

 


Option 1)

-11

This is incorrect

Option 2)

-12

This is correct

Option 3)

-13

This is incorrect

Option 4)

-14

This is incorrect

Posted by

Aadil

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