x^2+2x=140

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Solution for x^2+2x=140 equation:


Simplifying
x2 + 2x = 140

Reorder the terms:
2x + x2 = 140

Solving
2x + x2 = 140

Solving for variable 'x'.

Reorder the terms:
-140 + 2x + x2 = 140 + -140

Combine like terms: 140 + -140 = 0
-140 + 2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '140' to each side of the equation.
-140 + 2x + 140 + x2 = 0 + 140

Reorder the terms:
-140 + 140 + 2x + x2 = 0 + 140

Combine like terms: -140 + 140 = 0
0 + 2x + x2 = 0 + 140
2x + x2 = 0 + 140

Combine like terms: 0 + 140 = 140
2x + x2 = 140

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 140 + 1

Reorder the terms:
1 + 2x + x2 = 140 + 1

Combine like terms: 140 + 1 = 141
1 + 2x + x2 = 141

Factor a perfect square on the left side:
(x + 1)(x + 1) = 141

Calculate the square root of the right side: 11.874342087

Break this problem into two subproblems by setting 
(x + 1) equal to 11.874342087 and -11.874342087.

Subproblem 1

x + 1 = 11.874342087 Simplifying x + 1 = 11.874342087 Reorder the terms: 1 + x = 11.874342087 Solving 1 + x = 11.874342087 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 11.874342087 + -1 Combine like terms: 1 + -1 = 0 0 + x = 11.874342087 + -1 x = 11.874342087 + -1 Combine like terms: 11.874342087 + -1 = 10.874342087 x = 10.874342087 Simplifying x = 10.874342087

Subproblem 2

x + 1 = -11.874342087 Simplifying x + 1 = -11.874342087 Reorder the terms: 1 + x = -11.874342087 Solving 1 + x = -11.874342087 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -11.874342087 + -1 Combine like terms: 1 + -1 = 0 0 + x = -11.874342087 + -1 x = -11.874342087 + -1 Combine like terms: -11.874342087 + -1 = -12.874342087 x = -12.874342087 Simplifying x = -12.874342087

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.874342087, -12.874342087}

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