145=x^2+2x

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Solution for 145=x^2+2x equation:


Simplifying
145 = x2 + 2x

Reorder the terms:
145 = 2x + x2

Solving
145 = 2x + x2

Solving for variable 'x'.

Reorder the terms:
145 + -2x + -1x2 = 2x + -2x + x2 + -1x2

Combine like terms: 2x + -2x = 0
145 + -2x + -1x2 = 0 + x2 + -1x2
145 + -2x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
145 + -2x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-145 + 2x + x2 = 0

Move the constant term to the right:

Add '145' to each side of the equation.
-145 + 2x + 145 + x2 = 0 + 145

Reorder the terms:
-145 + 145 + 2x + x2 = 0 + 145

Combine like terms: -145 + 145 = 0
0 + 2x + x2 = 0 + 145
2x + x2 = 0 + 145

Combine like terms: 0 + 145 = 145
2x + x2 = 145

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 = 145 + 1

Reorder the terms:
1 + 2x + x2 = 145 + 1

Combine like terms: 145 + 1 = 146
1 + 2x + x2 = 146

Factor a perfect square on the left side:
(x + 1)(x + 1) = 146

Calculate the square root of the right side: 12.083045974

Break this problem into two subproblems by setting 
(x + 1) equal to 12.083045974 and -12.083045974.

Subproblem 1

x + 1 = 12.083045974 Simplifying x + 1 = 12.083045974 Reorder the terms: 1 + x = 12.083045974 Solving 1 + x = 12.083045974 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 = 12.083045974 + -1 Combine like terms: 1 + -1 = 0 0 + x = 12.083045974 + -1 x = 12.083045974 + -1 Combine like terms: 12.083045974 + -1 = 11.083045974 x = 11.083045974 Simplifying x = 11.083045974

Subproblem 2

x + 1 = -12.083045974 Simplifying x + 1 = -12.083045974 Reorder the terms: 1 + x = -12.083045974 Solving 1 + x = -12.083045974 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 = -12.083045974 + -1 Combine like terms: 1 + -1 = 0 0 + x = -12.083045974 + -1 x = -12.083045974 + -1 Combine like terms: -12.083045974 + -1 = -13.083045974 x = -13.083045974 Simplifying x = -13.083045974

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.083045974, -13.083045974}

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