x^2+x-1600=0

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Solution for x^2+x-1600=0 equation:


Simplifying
x2 + x + -1600 = 0

Reorder the terms:
-1600 + x + x2 = 0

Solving
-1600 + x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '1600' to each side of the equation.
-1600 + x + 1600 + x2 = 0 + 1600

Reorder the terms:
-1600 + 1600 + x + x2 = 0 + 1600

Combine like terms: -1600 + 1600 = 0
0 + x + x2 = 0 + 1600
x + x2 = 0 + 1600

Combine like terms: 0 + 1600 = 1600
x + x2 = 1600

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
x + 0.25 + x2 = 1600 + 0.25

Reorder the terms:
0.25 + x + x2 = 1600 + 0.25

Combine like terms: 1600 + 0.25 = 1600.25
0.25 + x + x2 = 1600.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 1600.25

Calculate the square root of the right side: 40.003124878

Break this problem into two subproblems by setting 
(x + 0.5) equal to 40.003124878 and -40.003124878.

Subproblem 1

x + 0.5 = 40.003124878 Simplifying x + 0.5 = 40.003124878 Reorder the terms: 0.5 + x = 40.003124878 Solving 0.5 + x = 40.003124878 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 40.003124878 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 40.003124878 + -0.5 x = 40.003124878 + -0.5 Combine like terms: 40.003124878 + -0.5 = 39.503124878 x = 39.503124878 Simplifying x = 39.503124878

Subproblem 2

x + 0.5 = -40.003124878 Simplifying x + 0.5 = -40.003124878 Reorder the terms: 0.5 + x = -40.003124878 Solving 0.5 + x = -40.003124878 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -40.003124878 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -40.003124878 + -0.5 x = -40.003124878 + -0.5 Combine like terms: -40.003124878 + -0.5 = -40.503124878 x = -40.503124878 Simplifying x = -40.503124878

Solution

The solution to the problem is based on the solutions from the subproblems. x = {39.503124878, -40.503124878}

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