x^2+23x+128=0

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Solution for x^2+23x+128=0 equation:


Simplifying
x2 + 23x + 128 = 0

Reorder the terms:
128 + 23x + x2 = 0

Solving
128 + 23x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-128' to each side of the equation.
128 + 23x + -128 + x2 = 0 + -128

Reorder the terms:
128 + -128 + 23x + x2 = 0 + -128

Combine like terms: 128 + -128 = 0
0 + 23x + x2 = 0 + -128
23x + x2 = 0 + -128

Combine like terms: 0 + -128 = -128
23x + x2 = -128

The x term is 23x.  Take half its coefficient (11.5).
Square it (132.25) and add it to both sides.

Add '132.25' to each side of the equation.
23x + 132.25 + x2 = -128 + 132.25

Reorder the terms:
132.25 + 23x + x2 = -128 + 132.25

Combine like terms: -128 + 132.25 = 4.25
132.25 + 23x + x2 = 4.25

Factor a perfect square on the left side:
(x + 11.5)(x + 11.5) = 4.25

Calculate the square root of the right side: 2.061552813

Break this problem into two subproblems by setting 
(x + 11.5) equal to 2.061552813 and -2.061552813.

Subproblem 1

x + 11.5 = 2.061552813 Simplifying x + 11.5 = 2.061552813 Reorder the terms: 11.5 + x = 2.061552813 Solving 11.5 + x = 2.061552813 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-11.5' to each side of the equation. 11.5 + -11.5 + x = 2.061552813 + -11.5 Combine like terms: 11.5 + -11.5 = 0.0 0.0 + x = 2.061552813 + -11.5 x = 2.061552813 + -11.5 Combine like terms: 2.061552813 + -11.5 = -9.438447187 x = -9.438447187 Simplifying x = -9.438447187

Subproblem 2

x + 11.5 = -2.061552813 Simplifying x + 11.5 = -2.061552813 Reorder the terms: 11.5 + x = -2.061552813 Solving 11.5 + x = -2.061552813 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-11.5' to each side of the equation. 11.5 + -11.5 + x = -2.061552813 + -11.5 Combine like terms: 11.5 + -11.5 = 0.0 0.0 + x = -2.061552813 + -11.5 x = -2.061552813 + -11.5 Combine like terms: -2.061552813 + -11.5 = -13.561552813 x = -13.561552813 Simplifying x = -13.561552813

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-9.438447187, -13.561552813}

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