(0.3-3.21)2=x

Solution for (0.3-3.21)2=x equation:

Simplifying
(0.3 + -3.21) * 2 = x

Combine like terms: 0.3 + -3.21 = -2.91
(-2.91) * 2 = x

Multiply -2.91 * 2
-5.82 = x

Solving
-5.82 = x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
-5.82 + -1x = x + -1x

Combine like terms: x + -1x = 0
-5.82 + -1x = 0

Add '5.82' to each side of the equation.
-5.82 + 5.82 + -1x = 0 + 5.82

Combine like terms: -5.82 + 5.82 = 0.00
0.00 + -1x = 0 + 5.82
-1x = 0 + 5.82

Combine like terms: 0 + 5.82 = 5.82
-1x = 5.82

Divide each side by '-1'.
x = -5.82

Simplifying
x = -5.82