Respuesta :
Answer:
We can substitute t = x² to make the given equation quadratic.
Step-by-step explanation:
The given equation is,
[tex]4x^4-21x^2+20=0[/tex]
This is a polynomial equation of degree 4.
The standard form of a quadratic equation is,
[tex]ax^2+bx+c=0[/tex]
The given equation can be written as,
[tex]4(x^2)^2-21x^2+20=0[/tex]
Substitute x² = t,
[tex]4(t)^2-21t+20=0[/tex]
This a quadratic equation because the degree of the equation is 2.
