0.14=x(0.1+2x)

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Solution for 0.14=x(0.1+2x) equation:


Simplifying
0.14 = x(0.1 + 2x)
0.14 = (0.1 * x + 2x * x)
0.14 = (0.1x + 2x2)

Solving
0.14 = 0.1x + 2x2

Solving for variable 'x'.

Reorder the terms:
0.14 + -0.1x + -2x2 = 0.1x + -0.1x + 2x2 + -2x2

Combine like terms: 0.1x + -0.1x = 0.0
0.14 + -0.1x + -2x2 = 0.0 + 2x2 + -2x2
0.14 + -0.1x + -2x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
0.14 + -0.1x + -2x2 = 0

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
-0.07 + 0.05x + x2 = 0

Move the constant term to the right:

Add '0.07' to each side of the equation.
-0.07 + 0.05x + 0.07 + x2 = 0 + 0.07

Reorder the terms:
-0.07 + 0.07 + 0.05x + x2 = 0 + 0.07

Combine like terms: -0.07 + 0.07 = 0.00
0.00 + 0.05x + x2 = 0 + 0.07
0.05x + x2 = 0 + 0.07

Combine like terms: 0 + 0.07 = 0.07
0.05x + x2 = 0.07

The x term is 0.05x.  Take half its coefficient (0.025).
Square it (0.000625) and add it to both sides.

Add '0.000625' to each side of the equation.
0.05x + 0.000625 + x2 = 0.07 + 0.000625

Reorder the terms:
0.000625 + 0.05x + x2 = 0.07 + 0.000625

Combine like terms: 0.07 + 0.000625 = 0.070625
0.000625 + 0.05x + x2 = 0.070625

Factor a perfect square on the left side:
(x + 0.025)(x + 0.025) = 0.070625

Calculate the square root of the right side: 0.265753645

Break this problem into two subproblems by setting 
(x + 0.025) equal to 0.265753645 and -0.265753645.

Subproblem 1

x + 0.025 = 0.265753645 Simplifying x + 0.025 = 0.265753645 Reorder the terms: 0.025 + x = 0.265753645 Solving 0.025 + x = 0.265753645 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.025' to each side of the equation. 0.025 + -0.025 + x = 0.265753645 + -0.025 Combine like terms: 0.025 + -0.025 = 0.000 0.000 + x = 0.265753645 + -0.025 x = 0.265753645 + -0.025 Combine like terms: 0.265753645 + -0.025 = 0.240753645 x = 0.240753645 Simplifying x = 0.240753645

Subproblem 2

x + 0.025 = -0.265753645 Simplifying x + 0.025 = -0.265753645 Reorder the terms: 0.025 + x = -0.265753645 Solving 0.025 + x = -0.265753645 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.025' to each side of the equation. 0.025 + -0.025 + x = -0.265753645 + -0.025 Combine like terms: 0.025 + -0.025 = 0.000 0.000 + x = -0.265753645 + -0.025 x = -0.265753645 + -0.025 Combine like terms: -0.265753645 + -0.025 = -0.290753645 x = -0.290753645 Simplifying x = -0.290753645

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.240753645, -0.290753645}

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