2(x).4(2x)=16

Solution for 2(x).4(2x)=16 equation:

Simplifying
2(x) * 0.4(2x) = 16

Remove parenthesis around (2x)
2x * 0.4 * 2x = 16

Reorder the terms for easier multiplication:
2 * 0.4 * 2x * x = 16

Multiply 2 * 0.4
0.8 * 2x * x = 16

Multiply 0.8 * 2
1.6x * x = 16

Multiply x * x
1.6x2 = 16

Solving
1.6x2 = 16

Solving for variable 'x'.

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

Divide each side by '1.6'.
x2 = 10

Simplifying
x2 = 10

Take the square root of each side:
x = {-3.16227766, 3.16227766}