Answer:
Step-by-step explanation:
A quadratic has HIGHEST power being [tex]x^{2}[/tex]...
1 and 2 are both quadratic
3 for sure is not.
if 4 is expanded, the
[tex]x^{2}[/tex] -4x + 4 = [tex]x^{2}[/tex] + x becomes -5x+ 4 = 0 which is NOT quadratic
