x^2+2x-106.25=0

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Solution for x^2+2x-106.25=0 equation:


Simplifying
x2 + 2x + -106.25 = 0

Reorder the terms:
-106.25 + 2x + x2 = 0

Solving
-106.25 + 2x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '106.25' to each side of the equation.
-106.25 + 2x + 106.25 + x2 = 0 + 106.25

Reorder the terms:
-106.25 + 106.25 + 2x + x2 = 0 + 106.25

Combine like terms: -106.25 + 106.25 = 0.00
0.00 + 2x + x2 = 0 + 106.25
2x + x2 = 0 + 106.25

Combine like terms: 0 + 106.25 = 106.25
2x + x2 = 106.25

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 = 106.25 + 1

Reorder the terms:
1 + 2x + x2 = 106.25 + 1

Combine like terms: 106.25 + 1 = 107.25
1 + 2x + x2 = 107.25

Factor a perfect square on the left side:
(x + 1)(x + 1) = 107.25

Calculate the square root of the right side: 10.356157589

Break this problem into two subproblems by setting 
(x + 1) equal to 10.356157589 and -10.356157589.

Subproblem 1

x + 1 = 10.356157589 Simplifying x + 1 = 10.356157589 Reorder the terms: 1 + x = 10.356157589 Solving 1 + x = 10.356157589 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 = 10.356157589 + -1 Combine like terms: 1 + -1 = 0 0 + x = 10.356157589 + -1 x = 10.356157589 + -1 Combine like terms: 10.356157589 + -1 = 9.356157589 x = 9.356157589 Simplifying x = 9.356157589

Subproblem 2

x + 1 = -10.356157589 Simplifying x + 1 = -10.356157589 Reorder the terms: 1 + x = -10.356157589 Solving 1 + x = -10.356157589 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 = -10.356157589 + -1 Combine like terms: 1 + -1 = 0 0 + x = -10.356157589 + -1 x = -10.356157589 + -1 Combine like terms: -10.356157589 + -1 = -11.356157589 x = -11.356157589 Simplifying x = -11.356157589

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.356157589, -11.356157589}

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