Answer:
[tex]x^4-5x^2-6=0[/tex]
Step-by-step explanation:
A quadratic equation is always in the form of ;
[tex]ax^2 +bx+c =0[/tex]
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 :)
