Question 251347
It is best to only have one problem per question. There are many reasons.
Do not shout! Using capital letters is shouting.
What is squared? just the 1.6 x^2 or (1.6x)^2
for now 1.6x^2-24=0
divide by 8 
.2x^2-3=0
.2x^2=3
divide by .2
x^2=3/.2
x^2=30/2
x^2=15
x=+\-sqrt(15)
which will be just a little less than 4 since 4^2=16