Question

Which of these options is not a quadratic equation in x?

Answer 1

`x^4-5x^2-6=0`

Explanation:

A quadratic equation is always in the form of ;

`ax^2 +bx+c =0`

Number 1 : Can be solved using factorization , Quadratic equation or Completing the square method

Number 2 : Quadratic formula or Completing the square method

Number 3 :Difference of two squares

Number 4 : not a quadratic equation but can be solved using Factorization

I Hope it Helps :)