mình biết rồi

f(x)=ax^4+bx^3+cx^2+dx+e, vì f(x)=f(-x) nên ax^4+bx^3+cx^2+dx+e=a(-x)^4+b(-x)^3+c(-x)^2+d(-x)+e

suy ra 2b.x^3+2d.x=0, suy ra b=d=0

They have chosen John for the school’s football team.

- John has…………………………………………