.1x^2+.2x=20

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Solution for .1x^2+.2x=20 equation:


Simplifying
0.1x2 + 0.2x = 20

Reorder the terms:
0.2x + 0.1x2 = 20

Solving
0.2x + 0.1x2 = 20

Solving for variable 'x'.

Reorder the terms:
-20 + 0.2x + 0.1x2 = 20 + -20

Combine like terms: 20 + -20 = 0
-20 + 0.2x + 0.1x2 = 0

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

Divide each side by '0.1'.
-200 + 2x + x2 = 0

Move the constant term to the right:

Add '200' to each side of the equation.
-200 + 2x + 200 + x2 = 0 + 200

Reorder the terms:
-200 + 200 + 2x + x2 = 0 + 200

Combine like terms: -200 + 200 = 0
0 + 2x + x2 = 0 + 200
2x + x2 = 0 + 200

Combine like terms: 0 + 200 = 200
2x + x2 = 200

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 200 + 1

Reorder the terms:
1 + 2x + x2 = 200 + 1

Combine like terms: 200 + 1 = 201
1 + 2x + x2 = 201

Factor a perfect square on the left side:
(x + 1)(x + 1) = 201

Calculate the square root of the right side: 14.177446879

Break this problem into two subproblems by setting 
(x + 1) equal to 14.177446879 and -14.177446879.

Subproblem 1

x + 1 = 14.177446879 Simplifying x + 1 = 14.177446879 Reorder the terms: 1 + x = 14.177446879 Solving 1 + x = 14.177446879 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 14.177446879 + -1 Combine like terms: 1 + -1 = 0 0 + x = 14.177446879 + -1 x = 14.177446879 + -1 Combine like terms: 14.177446879 + -1 = 13.177446879 x = 13.177446879 Simplifying x = 13.177446879

Subproblem 2

x + 1 = -14.177446879 Simplifying x + 1 = -14.177446879 Reorder the terms: 1 + x = -14.177446879 Solving 1 + x = -14.177446879 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -14.177446879 + -1 Combine like terms: 1 + -1 = 0 0 + x = -14.177446879 + -1 x = -14.177446879 + -1 Combine like terms: -14.177446879 + -1 = -15.177446879 x = -15.177446879 Simplifying x = -15.177446879

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.177446879, -15.177446879}

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