.1x^2+.2x-.3=0

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Solution for .1x^2+.2x-.3=0 equation:


Simplifying
0.1x2 + 0.2x + -0.3 = 0

Reorder the terms:
-0.3 + 0.2x + 0.1x2 = 0

Solving
-0.3 + 0.2x + 0.1x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.1'.
-3 + 2x + x2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + 2x + 3 + x2 = 0 + 3

Reorder the terms:
-3 + 3 + 2x + x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + 2x + x2 = 0 + 3
2x + x2 = 0 + 3

Combine like terms: 0 + 3 = 3
2x + x2 = 3

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 = 3 + 1

Reorder the terms:
1 + 2x + x2 = 3 + 1

Combine like terms: 3 + 1 = 4
1 + 2x + x2 = 4

Factor a perfect square on the left side:
(x + 1)(x + 1) = 4

Calculate the square root of the right side: 2

Break this problem into two subproblems by setting 
(x + 1) equal to 2 and -2.

Subproblem 1

x + 1 = 2 Simplifying x + 1 = 2 Reorder the terms: 1 + x = 2 Solving 1 + x = 2 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 = 2 + -1 Combine like terms: 1 + -1 = 0 0 + x = 2 + -1 x = 2 + -1 Combine like terms: 2 + -1 = 1 x = 1 Simplifying x = 1

Subproblem 2

x + 1 = -2 Simplifying x + 1 = -2 Reorder the terms: 1 + x = -2 Solving 1 + x = -2 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 = -2 + -1 Combine like terms: 1 + -1 = 0 0 + x = -2 + -1 x = -2 + -1 Combine like terms: -2 + -1 = -3 x = -3 Simplifying x = -3

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1, -3}

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