x^2+x=700

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Solution for x^2+x=700 equation:


Simplifying
x2 + x = 700

Reorder the terms:
x + x2 = 700

Solving
x + x2 = 700

Solving for variable 'x'.

Reorder the terms:
-700 + x + x2 = 700 + -700

Combine like terms: 700 + -700 = 0
-700 + x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '700' to each side of the equation.
-700 + x + 700 + x2 = 0 + 700

Reorder the terms:
-700 + 700 + x + x2 = 0 + 700

Combine like terms: -700 + 700 = 0
0 + x + x2 = 0 + 700
x + x2 = 0 + 700

Combine like terms: 0 + 700 = 700
x + x2 = 700

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 = 700 + 0.25

Reorder the terms:
0.25 + x + x2 = 700 + 0.25

Combine like terms: 700 + 0.25 = 700.25
0.25 + x + x2 = 700.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 700.25

Calculate the square root of the right side: 26.462237245

Break this problem into two subproblems by setting 
(x + 0.5) equal to 26.462237245 and -26.462237245.

Subproblem 1

x + 0.5 = 26.462237245 Simplifying x + 0.5 = 26.462237245 Reorder the terms: 0.5 + x = 26.462237245 Solving 0.5 + x = 26.462237245 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 = 26.462237245 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 26.462237245 + -0.5 x = 26.462237245 + -0.5 Combine like terms: 26.462237245 + -0.5 = 25.962237245 x = 25.962237245 Simplifying x = 25.962237245

Subproblem 2

x + 0.5 = -26.462237245 Simplifying x + 0.5 = -26.462237245 Reorder the terms: 0.5 + x = -26.462237245 Solving 0.5 + x = -26.462237245 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 = -26.462237245 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -26.462237245 + -0.5 x = -26.462237245 + -0.5 Combine like terms: -26.462237245 + -0.5 = -26.962237245 x = -26.962237245 Simplifying x = -26.962237245

Solution

The solution to the problem is based on the solutions from the subproblems. x = {25.962237245, -26.962237245}

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