x^2+3x+.4=0.1

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Solution for x^2+3x+.4=0.1 equation:


Simplifying
x2 + 3x + 0.4 = 0.1

Reorder the terms:
0.4 + 3x + x2 = 0.1

Solving
0.4 + 3x + x2 = 0.1

Solving for variable 'x'.

Reorder the terms:
0.4 + -0.1 + 3x + x2 = 0.1 + -0.1

Combine like terms: 0.4 + -0.1 = 0.3
0.3 + 3x + x2 = 0.1 + -0.1

Combine like terms: 0.1 + -0.1 = 0.0
0.3 + 3x + x2 = 0.0

Begin completing the square.

Move the constant term to the right:

Add '-0.3' to each side of the equation.
0.3 + 3x + -0.3 + x2 = 0.0 + -0.3

Reorder the terms:
0.3 + -0.3 + 3x + x2 = 0.0 + -0.3

Combine like terms: 0.3 + -0.3 = 0.0
0.0 + 3x + x2 = 0.0 + -0.3
3x + x2 = 0.0 + -0.3

Combine like terms: 0.0 + -0.3 = -0.3
3x + x2 = -0.3

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = -0.3 + 2.25

Reorder the terms:
2.25 + 3x + x2 = -0.3 + 2.25

Combine like terms: -0.3 + 2.25 = 1.95
2.25 + 3x + x2 = 1.95

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 1.95

Calculate the square root of the right side: 1.396424004

Break this problem into two subproblems by setting 
(x + 1.5) equal to 1.396424004 and -1.396424004.

Subproblem 1

x + 1.5 = 1.396424004 Simplifying x + 1.5 = 1.396424004 Reorder the terms: 1.5 + x = 1.396424004 Solving 1.5 + x = 1.396424004 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = 1.396424004 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 1.396424004 + -1.5 x = 1.396424004 + -1.5 Combine like terms: 1.396424004 + -1.5 = -0.103575996 x = -0.103575996 Simplifying x = -0.103575996

Subproblem 2

x + 1.5 = -1.396424004 Simplifying x + 1.5 = -1.396424004 Reorder the terms: 1.5 + x = -1.396424004 Solving 1.5 + x = -1.396424004 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = -1.396424004 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -1.396424004 + -1.5 x = -1.396424004 + -1.5 Combine like terms: -1.396424004 + -1.5 = -2.896424004 x = -2.896424004 Simplifying x = -2.896424004

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.103575996, -2.896424004}

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