(x^2)+1.5(x)+0.4=0

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Solution for (x^2)+1.5(x)+0.4=0 equation:


Simplifying
(x2) + 1.5(x) + 0.4 = 0
x2 + 1.5(x) + 0.4 = 0

Reorder the terms:
0.4 + 1.5x + x2 = 0

Solving
0.4 + 1.5x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-0.4' to each side of the equation.
0.4 + 1.5x + -0.4 + x2 = 0 + -0.4

Reorder the terms:
0.4 + -0.4 + 1.5x + x2 = 0 + -0.4

Combine like terms: 0.4 + -0.4 = 0.0
0.0 + 1.5x + x2 = 0 + -0.4
1.5x + x2 = 0 + -0.4

Combine like terms: 0 + -0.4 = -0.4
1.5x + x2 = -0.4

The x term is 1.5x.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5x + 0.5625 + x2 = -0.4 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = -0.4 + 0.5625

Combine like terms: -0.4 + 0.5625 = 0.1625
0.5625 + 1.5x + x2 = 0.1625

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 0.1625

Calculate the square root of the right side: 0.403112887

Break this problem into two subproblems by setting 
(x + 0.75) equal to 0.403112887 and -0.403112887.

Subproblem 1

x + 0.75 = 0.403112887 Simplifying x + 0.75 = 0.403112887 Reorder the terms: 0.75 + x = 0.403112887 Solving 0.75 + x = 0.403112887 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = 0.403112887 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 0.403112887 + -0.75 x = 0.403112887 + -0.75 Combine like terms: 0.403112887 + -0.75 = -0.346887113 x = -0.346887113 Simplifying x = -0.346887113

Subproblem 2

x + 0.75 = -0.403112887 Simplifying x + 0.75 = -0.403112887 Reorder the terms: 0.75 + x = -0.403112887 Solving 0.75 + x = -0.403112887 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = -0.403112887 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -0.403112887 + -0.75 x = -0.403112887 + -0.75 Combine like terms: -0.403112887 + -0.75 = -1.153112887 x = -1.153112887 Simplifying x = -1.153112887

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.346887113, -1.153112887}

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