x*(x*0.2)=8000

Solution for x*(x*0.2)=8000 equation:

Simplifying
x(x * 0.2) = 8000

Reorder the terms for easier multiplication:
x(0.2x) = 8000

Remove parenthesis around (0.2x)
x * 0.2x = 8000

Reorder the terms for easier multiplication:
0.2x * x = 8000

Multiply x * x
0.2x2 = 8000

Solving
0.2x2 = 8000

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Divide each side by '0.2'.
x2 = 40000

Simplifying
x2 = 40000

Take the square root of each side:
x = {-200, 200}