x^2+2x=146

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Solution for x^2+2x=146 equation:


Simplifying
x2 + 2x = 146

Reorder the terms:
2x + x2 = 146

Solving
2x + x2 = 146

Solving for variable 'x'.

Reorder the terms:
-146 + 2x + x2 = 146 + -146

Combine like terms: 146 + -146 = 0
-146 + 2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '146' to each side of the equation.
-146 + 2x + 146 + x2 = 0 + 146

Reorder the terms:
-146 + 146 + 2x + x2 = 0 + 146

Combine like terms: -146 + 146 = 0
0 + 2x + x2 = 0 + 146
2x + x2 = 0 + 146

Combine like terms: 0 + 146 = 146
2x + x2 = 146

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 = 146 + 1

Reorder the terms:
1 + 2x + x2 = 146 + 1

Combine like terms: 146 + 1 = 147
1 + 2x + x2 = 147

Factor a perfect square on the left side:
(x + 1)(x + 1) = 147

Calculate the square root of the right side: 12.124355653

Break this problem into two subproblems by setting 
(x + 1) equal to 12.124355653 and -12.124355653.

Subproblem 1

x + 1 = 12.124355653 Simplifying x + 1 = 12.124355653 Reorder the terms: 1 + x = 12.124355653 Solving 1 + x = 12.124355653 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 = 12.124355653 + -1 Combine like terms: 1 + -1 = 0 0 + x = 12.124355653 + -1 x = 12.124355653 + -1 Combine like terms: 12.124355653 + -1 = 11.124355653 x = 11.124355653 Simplifying x = 11.124355653

Subproblem 2

x + 1 = -12.124355653 Simplifying x + 1 = -12.124355653 Reorder the terms: 1 + x = -12.124355653 Solving 1 + x = -12.124355653 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 = -12.124355653 + -1 Combine like terms: 1 + -1 = 0 0 + x = -12.124355653 + -1 x = -12.124355653 + -1 Combine like terms: -12.124355653 + -1 = -13.124355653 x = -13.124355653 Simplifying x = -13.124355653

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.124355653, -13.124355653}

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