0.1x^2+0.5x=0.2

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Solution for 0.1x^2+0.5x=0.2 equation:


Simplifying
0.1x2 + 0.5x = 0.2

Reorder the terms:
0.5x + 0.1x2 = 0.2

Solving
0.5x + 0.1x2 = 0.2

Solving for variable 'x'.

Reorder the terms:
-0.2 + 0.5x + 0.1x2 = 0.2 + -0.2

Combine like terms: 0.2 + -0.2 = 0.0
-0.2 + 0.5x + 0.1x2 = 0.0

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

Divide each side by '0.1'.
-2 + 5x + x2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + 5x + 2 + x2 = 0 + 2

Reorder the terms:
-2 + 2 + 5x + x2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + 5x + x2 = 0 + 2
5x + x2 = 0 + 2

Combine like terms: 0 + 2 = 2
5x + x2 = 2

The x term is 5x.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5x + 6.25 + x2 = 2 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 2 + 6.25

Combine like terms: 2 + 6.25 = 8.25
6.25 + 5x + x2 = 8.25

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 8.25

Calculate the square root of the right side: 2.872281323

Break this problem into two subproblems by setting 
(x + 2.5) equal to 2.872281323 and -2.872281323.

Subproblem 1

x + 2.5 = 2.872281323 Simplifying x + 2.5 = 2.872281323 Reorder the terms: 2.5 + x = 2.872281323 Solving 2.5 + x = 2.872281323 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = 2.872281323 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 2.872281323 + -2.5 x = 2.872281323 + -2.5 Combine like terms: 2.872281323 + -2.5 = 0.372281323 x = 0.372281323 Simplifying x = 0.372281323

Subproblem 2

x + 2.5 = -2.872281323 Simplifying x + 2.5 = -2.872281323 Reorder the terms: 2.5 + x = -2.872281323 Solving 2.5 + x = -2.872281323 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = -2.872281323 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -2.872281323 + -2.5 x = -2.872281323 + -2.5 Combine like terms: -2.872281323 + -2.5 = -5.372281323 x = -5.372281323 Simplifying x = -5.372281323

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.372281323, -5.372281323}

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