x^2+2x=27.5

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Solution for x^2+2x=27.5 equation:


Simplifying
x2 + 2x = 27.5

Reorder the terms:
2x + x2 = 27.5

Solving
2x + x2 = 27.5

Solving for variable 'x'.

Reorder the terms:
-27.5 + 2x + x2 = 27.5 + -27.5

Combine like terms: 27.5 + -27.5 = 0.0
-27.5 + 2x + x2 = 0.0

Begin completing the square.

Move the constant term to the right:

Add '27.5' to each side of the equation.
-27.5 + 2x + 27.5 + x2 = 0.0 + 27.5

Reorder the terms:
-27.5 + 27.5 + 2x + x2 = 0.0 + 27.5

Combine like terms: -27.5 + 27.5 = 0.0
0.0 + 2x + x2 = 0.0 + 27.5
2x + x2 = 0.0 + 27.5

Combine like terms: 0.0 + 27.5 = 27.5
2x + x2 = 27.5

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 = 27.5 + 1

Reorder the terms:
1 + 2x + x2 = 27.5 + 1

Combine like terms: 27.5 + 1 = 28.5
1 + 2x + x2 = 28.5

Factor a perfect square on the left side:
(x + 1)(x + 1) = 28.5

Calculate the square root of the right side: 5.338539126

Break this problem into two subproblems by setting 
(x + 1) equal to 5.338539126 and -5.338539126.

Subproblem 1

x + 1 = 5.338539126 Simplifying x + 1 = 5.338539126 Reorder the terms: 1 + x = 5.338539126 Solving 1 + x = 5.338539126 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 = 5.338539126 + -1 Combine like terms: 1 + -1 = 0 0 + x = 5.338539126 + -1 x = 5.338539126 + -1 Combine like terms: 5.338539126 + -1 = 4.338539126 x = 4.338539126 Simplifying x = 4.338539126

Subproblem 2

x + 1 = -5.338539126 Simplifying x + 1 = -5.338539126 Reorder the terms: 1 + x = -5.338539126 Solving 1 + x = -5.338539126 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 = -5.338539126 + -1 Combine like terms: 1 + -1 = 0 0 + x = -5.338539126 + -1 x = -5.338539126 + -1 Combine like terms: -5.338539126 + -1 = -6.338539126 x = -6.338539126 Simplifying x = -6.338539126

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.338539126, -6.338539126}

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