20=2x(x)

Solution for 20=2x(x) equation:

Simplifying
20 = 2x(x)

Multiply x * x
20 = 2x2

Solving
20 = 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.
20 + -2x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
20 + -2x2 = 0

Add '-20' to each side of the equation.
20 + -20 + -2x2 = 0 + -20

Combine like terms: 20 + -20 = 0
0 + -2x2 = 0 + -20
-2x2 = 0 + -20

Combine like terms: 0 + -20 = -20
-2x2 = -20

Divide each side by '-2'.
x2 = 10

Simplifying
x2 = 10

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