x(0.18x-1)=5

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Solution for x(0.18x-1)=5 equation:


Simplifying
x(0.18x + -1) = 5

Reorder the terms:
x(-1 + 0.18x) = 5
(-1 * x + 0.18x * x) = 5
(-1x + 0.18x2) = 5

Solving
-1x + 0.18x2 = 5

Solving for variable 'x'.

Reorder the terms:
-5 + -1x + 0.18x2 = 5 + -5

Combine like terms: 5 + -5 = 0
-5 + -1x + 0.18x2 = 0

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

Divide each side by '0.18'.
-27.77777778 + -5.555555556x + x2 = 0

Move the constant term to the right:

Add '27.77777778' to each side of the equation.
-27.77777778 + -5.555555556x + 27.77777778 + x2 = 0 + 27.77777778

Reorder the terms:
-27.77777778 + 27.77777778 + -5.555555556x + x2 = 0 + 27.77777778

Combine like terms: -27.77777778 + 27.77777778 = 0.00000000
0.00000000 + -5.555555556x + x2 = 0 + 27.77777778
-5.555555556x + x2 = 0 + 27.77777778

Combine like terms: 0 + 27.77777778 = 27.77777778
-5.555555556x + x2 = 27.77777778

The x term is -5.555555556x.  Take half its coefficient (-2.777777778).
Square it (7.716049384) and add it to both sides.

Add '7.716049384' to each side of the equation.
-5.555555556x + 7.716049384 + x2 = 27.77777778 + 7.716049384

Reorder the terms:
7.716049384 + -5.555555556x + x2 = 27.77777778 + 7.716049384

Combine like terms: 27.77777778 + 7.716049384 = 35.493827164
7.716049384 + -5.555555556x + x2 = 35.493827164

Factor a perfect square on the left side:
(x + -2.777777778)(x + -2.777777778) = 35.493827164

Calculate the square root of the right side: 5.957669608

Break this problem into two subproblems by setting 
(x + -2.777777778) equal to 5.957669608 and -5.957669608.

Subproblem 1

x + -2.777777778 = 5.957669608 Simplifying x + -2.777777778 = 5.957669608 Reorder the terms: -2.777777778 + x = 5.957669608 Solving -2.777777778 + x = 5.957669608 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.777777778' to each side of the equation. -2.777777778 + 2.777777778 + x = 5.957669608 + 2.777777778 Combine like terms: -2.777777778 + 2.777777778 = 0.000000000 0.000000000 + x = 5.957669608 + 2.777777778 x = 5.957669608 + 2.777777778 Combine like terms: 5.957669608 + 2.777777778 = 8.735447386 x = 8.735447386 Simplifying x = 8.735447386

Subproblem 2

x + -2.777777778 = -5.957669608 Simplifying x + -2.777777778 = -5.957669608 Reorder the terms: -2.777777778 + x = -5.957669608 Solving -2.777777778 + x = -5.957669608 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.777777778' to each side of the equation. -2.777777778 + 2.777777778 + x = -5.957669608 + 2.777777778 Combine like terms: -2.777777778 + 2.777777778 = 0.000000000 0.000000000 + x = -5.957669608 + 2.777777778 x = -5.957669608 + 2.777777778 Combine like terms: -5.957669608 + 2.777777778 = -3.17989183 x = -3.17989183 Simplifying x = -3.17989183

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.735447386, -3.17989183}

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