0.2=(x-30)x

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Solution for 0.2=(x-30)x equation:


Simplifying
0.2 = (x + -30) * x

Reorder the terms:
0.2 = (-30 + x) * x

Reorder the terms for easier multiplication:
0.2 = x(-30 + x)
0.2 = (-30 * x + x * x)
0.2 = (-30x + x2)

Solving
0.2 = -30x + x2

Solving for variable 'x'.

Reorder the terms:
0.2 + 30x + -1x2 = -30x + 30x + x2 + -1x2

Combine like terms: -30x + 30x = 0
0.2 + 30x + -1x2 = 0 + x2 + -1x2
0.2 + 30x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
0.2 + 30x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-0.2 + -30x + x2 = 0

Move the constant term to the right:

Add '0.2' to each side of the equation.
-0.2 + -30x + 0.2 + x2 = 0 + 0.2

Reorder the terms:
-0.2 + 0.2 + -30x + x2 = 0 + 0.2

Combine like terms: -0.2 + 0.2 = 0.0
0.0 + -30x + x2 = 0 + 0.2
-30x + x2 = 0 + 0.2

Combine like terms: 0 + 0.2 = 0.2
-30x + x2 = 0.2

The x term is -30x.  Take half its coefficient (-15).
Square it (225) and add it to both sides.

Add '225' to each side of the equation.
-30x + 225 + x2 = 0.2 + 225

Reorder the terms:
225 + -30x + x2 = 0.2 + 225

Combine like terms: 0.2 + 225 = 225.2
225 + -30x + x2 = 225.2

Factor a perfect square on the left side:
(x + -15)(x + -15) = 225.2

Calculate the square root of the right side: 15.006665186

Break this problem into two subproblems by setting 
(x + -15) equal to 15.006665186 and -15.006665186.

Subproblem 1

x + -15 = 15.006665186 Simplifying x + -15 = 15.006665186 Reorder the terms: -15 + x = 15.006665186 Solving -15 + x = 15.006665186 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + x = 15.006665186 + 15 Combine like terms: -15 + 15 = 0 0 + x = 15.006665186 + 15 x = 15.006665186 + 15 Combine like terms: 15.006665186 + 15 = 30.006665186 x = 30.006665186 Simplifying x = 30.006665186

Subproblem 2

x + -15 = -15.006665186 Simplifying x + -15 = -15.006665186 Reorder the terms: -15 + x = -15.006665186 Solving -15 + x = -15.006665186 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + x = -15.006665186 + 15 Combine like terms: -15 + 15 = 0 0 + x = -15.006665186 + 15 x = -15.006665186 + 15 Combine like terms: -15.006665186 + 15 = -0.006665186 x = -0.006665186 Simplifying x = -0.006665186

Solution

The solution to the problem is based on the solutions from the subproblems. x = {30.006665186, -0.006665186}

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