x^2+2x-2.24=0

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Solution for x^2+2x-2.24=0 equation:


Simplifying
x2 + 2x + -2.24 = 0

Reorder the terms:
-2.24 + 2x + x2 = 0

Solving
-2.24 + 2x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '2.24' to each side of the equation.
-2.24 + 2x + 2.24 + x2 = 0 + 2.24

Reorder the terms:
-2.24 + 2.24 + 2x + x2 = 0 + 2.24

Combine like terms: -2.24 + 2.24 = 0.00
0.00 + 2x + x2 = 0 + 2.24
2x + x2 = 0 + 2.24

Combine like terms: 0 + 2.24 = 2.24
2x + x2 = 2.24

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 = 2.24 + 1

Reorder the terms:
1 + 2x + x2 = 2.24 + 1

Combine like terms: 2.24 + 1 = 3.24
1 + 2x + x2 = 3.24

Factor a perfect square on the left side:
(x + 1)(x + 1) = 3.24

Calculate the square root of the right side: 1.8

Break this problem into two subproblems by setting 
(x + 1) equal to 1.8 and -1.8.

Subproblem 1

x + 1 = 1.8 Simplifying x + 1 = 1.8 Reorder the terms: 1 + x = 1.8 Solving 1 + x = 1.8 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 = 1.8 + -1 Combine like terms: 1 + -1 = 0 0 + x = 1.8 + -1 x = 1.8 + -1 Combine like terms: 1.8 + -1 = 0.8 x = 0.8 Simplifying x = 0.8

Subproblem 2

x + 1 = -1.8 Simplifying x + 1 = -1.8 Reorder the terms: 1 + x = -1.8 Solving 1 + x = -1.8 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 = -1.8 + -1 Combine like terms: 1 + -1 = 0 0 + x = -1.8 + -1 x = -1.8 + -1 Combine like terms: -1.8 + -1 = -2.8 x = -2.8 Simplifying x = -2.8

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.8, -2.8}

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