x^2+9x-256=0

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Solution for x^2+9x-256=0 equation:


Simplifying
x2 + 9x + -256 = 0

Reorder the terms:
-256 + 9x + x2 = 0

Solving
-256 + 9x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '256' to each side of the equation.
-256 + 9x + 256 + x2 = 0 + 256

Reorder the terms:
-256 + 256 + 9x + x2 = 0 + 256

Combine like terms: -256 + 256 = 0
0 + 9x + x2 = 0 + 256
9x + x2 = 0 + 256

Combine like terms: 0 + 256 = 256
9x + x2 = 256

The x term is 9x.  Take half its coefficient (4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
9x + 20.25 + x2 = 256 + 20.25

Reorder the terms:
20.25 + 9x + x2 = 256 + 20.25

Combine like terms: 256 + 20.25 = 276.25
20.25 + 9x + x2 = 276.25

Factor a perfect square on the left side:
(x + 4.5)(x + 4.5) = 276.25

Calculate the square root of the right side: 16.620770139

Break this problem into two subproblems by setting 
(x + 4.5) equal to 16.620770139 and -16.620770139.

Subproblem 1

x + 4.5 = 16.620770139 Simplifying x + 4.5 = 16.620770139 Reorder the terms: 4.5 + x = 16.620770139 Solving 4.5 + x = 16.620770139 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = 16.620770139 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = 16.620770139 + -4.5 x = 16.620770139 + -4.5 Combine like terms: 16.620770139 + -4.5 = 12.120770139 x = 12.120770139 Simplifying x = 12.120770139

Subproblem 2

x + 4.5 = -16.620770139 Simplifying x + 4.5 = -16.620770139 Reorder the terms: 4.5 + x = -16.620770139 Solving 4.5 + x = -16.620770139 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = -16.620770139 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = -16.620770139 + -4.5 x = -16.620770139 + -4.5 Combine like terms: -16.620770139 + -4.5 = -21.120770139 x = -21.120770139 Simplifying x = -21.120770139

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.120770139, -21.120770139}

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