x^2-2x-22.4=0

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Solution for x^2-2x-22.4=0 equation:


Simplifying
x2 + -2x + -22.4 = 0

Reorder the terms:
-22.4 + -2x + x2 = 0

Solving
-22.4 + -2x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '22.4' to each side of the equation.
-22.4 + -2x + 22.4 + x2 = 0 + 22.4

Reorder the terms:
-22.4 + 22.4 + -2x + x2 = 0 + 22.4

Combine like terms: -22.4 + 22.4 = 0.0
0.0 + -2x + x2 = 0 + 22.4
-2x + x2 = 0 + 22.4

Combine like terms: 0 + 22.4 = 22.4
-2x + x2 = 22.4

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 = 22.4 + 1

Reorder the terms:
1 + -2x + x2 = 22.4 + 1

Combine like terms: 22.4 + 1 = 23.4
1 + -2x + x2 = 23.4

Factor a perfect square on the left side:
(x + -1)(x + -1) = 23.4

Calculate the square root of the right side: 4.837354649

Break this problem into two subproblems by setting 
(x + -1) equal to 4.837354649 and -4.837354649.

Subproblem 1

x + -1 = 4.837354649 Simplifying x + -1 = 4.837354649 Reorder the terms: -1 + x = 4.837354649 Solving -1 + x = 4.837354649 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 = 4.837354649 + 1 Combine like terms: -1 + 1 = 0 0 + x = 4.837354649 + 1 x = 4.837354649 + 1 Combine like terms: 4.837354649 + 1 = 5.837354649 x = 5.837354649 Simplifying x = 5.837354649

Subproblem 2

x + -1 = -4.837354649 Simplifying x + -1 = -4.837354649 Reorder the terms: -1 + x = -4.837354649 Solving -1 + x = -4.837354649 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 = -4.837354649 + 1 Combine like terms: -1 + 1 = 0 0 + x = -4.837354649 + 1 x = -4.837354649 + 1 Combine like terms: -4.837354649 + 1 = -3.837354649 x = -3.837354649 Simplifying x = -3.837354649

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.837354649, -3.837354649}

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