I have been sitting in my room for... 5 hours now, 5 hours!! Trying to do this algebra 2 sheet on quadratic equations and I am completley lost!!!

I can do the easy one's like

(t^2-9)=0

(t-3)(t+3)=0

t-3=0 t+3=0

t=3 t=-3

{3,-3}

the steps i was taught were

get zero on one side of equation

factor completely

set each to zero

solve

but I am stuck on these problems I can get them all set to zero and then that's it, i'm stuck after that

^2 = squared ^3 = cubed ^4=to the 4th power

1) t^3-t=0

2)3u^2+7u-6=0

3)x^2-6x-72=0

4)(s-1)^2(s-3)^2

5)0.2x^2-1.1x+0.5=0

6) (x^2-3)^2+(x^2-3)-2=0

7) (x^2-3x+2)^3=0

8) f(x)=(x+1)^4 +4(x+1)^3

Ifanyonecould help me that would be!!!!!!! I need help a.s.a.p!!!!amazing