x^2+x=340

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Solution for x^2+x=340 equation:


Simplifying
x2 + x = 340

Reorder the terms:
x + x2 = 340

Solving
x + x2 = 340

Solving for variable 'x'.

Reorder the terms:
-340 + x + x2 = 340 + -340

Combine like terms: 340 + -340 = 0
-340 + x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '340' to each side of the equation.
-340 + x + 340 + x2 = 0 + 340

Reorder the terms:
-340 + 340 + x + x2 = 0 + 340

Combine like terms: -340 + 340 = 0
0 + x + x2 = 0 + 340
x + x2 = 0 + 340

Combine like terms: 0 + 340 = 340
x + x2 = 340

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 = 340 + 0.25

Reorder the terms:
0.25 + x + x2 = 340 + 0.25

Combine like terms: 340 + 0.25 = 340.25
0.25 + x + x2 = 340.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 340.25

Calculate the square root of the right side: 18.445866746

Break this problem into two subproblems by setting 
(x + 0.5) equal to 18.445866746 and -18.445866746.

Subproblem 1

x + 0.5 = 18.445866746 Simplifying x + 0.5 = 18.445866746 Reorder the terms: 0.5 + x = 18.445866746 Solving 0.5 + x = 18.445866746 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 = 18.445866746 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 18.445866746 + -0.5 x = 18.445866746 + -0.5 Combine like terms: 18.445866746 + -0.5 = 17.945866746 x = 17.945866746 Simplifying x = 17.945866746

Subproblem 2

x + 0.5 = -18.445866746 Simplifying x + 0.5 = -18.445866746 Reorder the terms: 0.5 + x = -18.445866746 Solving 0.5 + x = -18.445866746 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 = -18.445866746 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -18.445866746 + -0.5 x = -18.445866746 + -0.5 Combine like terms: -18.445866746 + -0.5 = -18.945866746 x = -18.945866746 Simplifying x = -18.945866746

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.945866746, -18.945866746}

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