800=(2x)(x)

Solution for 800=(2x)(x) equation:

Simplifying
800 = (2x)(x)

Remove parenthesis around (2x)
800 = 2x(x)

Multiply x * x
800 = 2x2

Solving
800 = 2x2

Solving for variable 'x'.

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

Add '-2x2' to each side of the equation.
800 + -2x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
800 + -2x2 = 0

Add '-800' to each side of the equation.
800 + -800 + -2x2 = 0 + -800

Combine like terms: 800 + -800 = 0
0 + -2x2 = 0 + -800
-2x2 = 0 + -800

Combine like terms: 0 + -800 = -800
-2x2 = -800

Divide each side by '-2'.
x2 = 400

Simplifying
x2 = 400

Take the square root of each side:
x = {-20, 20}