determine whether each of the following equations represent a quadratic equation or not.

x+4=0
x²-4x+4=0
2m³+5m²-3m+1=0
y²-81=2
2²=0
t-3=t²
8k²=1
4-h=0
(b+3)(b-2)=0
4(d+6)=5

pa answer plss​