x^2+1.2x-11.4=0

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Solution for x^2+1.2x-11.4=0 equation:


Simplifying
x2 + 1.2x + -11.4 = 0

Reorder the terms:
-11.4 + 1.2x + x2 = 0

Solving
-11.4 + 1.2x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '11.4' to each side of the equation.
-11.4 + 1.2x + 11.4 + x2 = 0 + 11.4

Reorder the terms:
-11.4 + 11.4 + 1.2x + x2 = 0 + 11.4

Combine like terms: -11.4 + 11.4 = 0.0
0.0 + 1.2x + x2 = 0 + 11.4
1.2x + x2 = 0 + 11.4

Combine like terms: 0 + 11.4 = 11.4
1.2x + x2 = 11.4

The x term is 1.2x.  Take half its coefficient (0.6).
Square it (0.36) and add it to both sides.

Add '0.36' to each side of the equation.
1.2x + 0.36 + x2 = 11.4 + 0.36

Reorder the terms:
0.36 + 1.2x + x2 = 11.4 + 0.36

Combine like terms: 11.4 + 0.36 = 11.76
0.36 + 1.2x + x2 = 11.76

Factor a perfect square on the left side:
(x + 0.6)(x + 0.6) = 11.76

Calculate the square root of the right side: 3.42928564

Break this problem into two subproblems by setting 
(x + 0.6) equal to 3.42928564 and -3.42928564.

Subproblem 1

x + 0.6 = 3.42928564 Simplifying x + 0.6 = 3.42928564 Reorder the terms: 0.6 + x = 3.42928564 Solving 0.6 + x = 3.42928564 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.6' to each side of the equation. 0.6 + -0.6 + x = 3.42928564 + -0.6 Combine like terms: 0.6 + -0.6 = 0.0 0.0 + x = 3.42928564 + -0.6 x = 3.42928564 + -0.6 Combine like terms: 3.42928564 + -0.6 = 2.82928564 x = 2.82928564 Simplifying x = 2.82928564

Subproblem 2

x + 0.6 = -3.42928564 Simplifying x + 0.6 = -3.42928564 Reorder the terms: 0.6 + x = -3.42928564 Solving 0.6 + x = -3.42928564 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.6' to each side of the equation. 0.6 + -0.6 + x = -3.42928564 + -0.6 Combine like terms: 0.6 + -0.6 = 0.0 0.0 + x = -3.42928564 + -0.6 x = -3.42928564 + -0.6 Combine like terms: -3.42928564 + -0.6 = -4.02928564 x = -4.02928564 Simplifying x = -4.02928564

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.82928564, -4.02928564}

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