-0.5x^2-x+5.7=0

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Solution for -0.5x^2-x+5.7=0 equation:


Simplifying
-0.5x2 + -1x + 5.7 = 0

Reorder the terms:
5.7 + -1x + -0.5x2 = 0

Solving
5.7 + -1x + -0.5x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-0.5 the coefficient of the squared term: 

Divide each side by '-0.5'.
-11.4 + 2x + x2 = 0

Move the constant term to the right:

Add '11.4' to each side of the equation.
-11.4 + 2x + 11.4 + x2 = 0 + 11.4

Reorder the terms:
-11.4 + 11.4 + 2x + x2 = 0 + 11.4

Combine like terms: -11.4 + 11.4 = 0.0
0.0 + 2x + x2 = 0 + 11.4
2x + x2 = 0 + 11.4

Combine like terms: 0 + 11.4 = 11.4
2x + x2 = 11.4

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 = 11.4 + 1

Reorder the terms:
1 + 2x + x2 = 11.4 + 1

Combine like terms: 11.4 + 1 = 12.4
1 + 2x + x2 = 12.4

Factor a perfect square on the left side:
(x + 1)(x + 1) = 12.4

Calculate the square root of the right side: 3.521363372

Break this problem into two subproblems by setting 
(x + 1) equal to 3.521363372 and -3.521363372.

Subproblem 1

x + 1 = 3.521363372 Simplifying x + 1 = 3.521363372 Reorder the terms: 1 + x = 3.521363372 Solving 1 + x = 3.521363372 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 = 3.521363372 + -1 Combine like terms: 1 + -1 = 0 0 + x = 3.521363372 + -1 x = 3.521363372 + -1 Combine like terms: 3.521363372 + -1 = 2.521363372 x = 2.521363372 Simplifying x = 2.521363372

Subproblem 2

x + 1 = -3.521363372 Simplifying x + 1 = -3.521363372 Reorder the terms: 1 + x = -3.521363372 Solving 1 + x = -3.521363372 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 = -3.521363372 + -1 Combine like terms: 1 + -1 = 0 0 + x = -3.521363372 + -1 x = -3.521363372 + -1 Combine like terms: -3.521363372 + -1 = -4.521363372 x = -4.521363372 Simplifying x = -4.521363372

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.521363372, -4.521363372}

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