2.17=x^2-x

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Solution for 2.17=x^2-x equation:


Simplifying
2.17 = x2 + -1x

Reorder the terms:
2.17 = -1x + x2

Solving
2.17 = -1x + x2

Solving for variable 'x'.

Reorder the terms:
2.17 + x + -1x2 = -1x + x + x2 + -1x2

Combine like terms: -1x + x = 0
2.17 + x + -1x2 = 0 + x2 + -1x2
2.17 + x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
2.17 + x + -1x2 = 0

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

Divide each side by '-1'.
-2.17 + -1x + x2 = 0

Move the constant term to the right:

Add '2.17' to each side of the equation.
-2.17 + -1x + 2.17 + x2 = 0 + 2.17

Reorder the terms:
-2.17 + 2.17 + -1x + x2 = 0 + 2.17

Combine like terms: -2.17 + 2.17 = 0.00
0.00 + -1x + x2 = 0 + 2.17
-1x + x2 = 0 + 2.17

Combine like terms: 0 + 2.17 = 2.17
-1x + x2 = 2.17

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1x + 0.25 + x2 = 2.17 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 2.17 + 0.25

Combine like terms: 2.17 + 0.25 = 2.42
0.25 + -1x + x2 = 2.42

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 2.42

Calculate the square root of the right side: 1.555634919

Break this problem into two subproblems by setting 
(x + 0.5) equal to 1.555634919 and -1.555634919.

Subproblem 1

x + 0.5 = 1.555634919 Simplifying x + 0.5 = 1.555634919 Reorder the terms: 0.5 + x = 1.555634919 Solving 0.5 + x = 1.555634919 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 1.555634919 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 1.555634919 + -0.5 x = 1.555634919 + -0.5 Combine like terms: 1.555634919 + -0.5 = 1.055634919 x = 1.055634919 Simplifying x = 1.055634919

Subproblem 2

x + 0.5 = -1.555634919 Simplifying x + 0.5 = -1.555634919 Reorder the terms: 0.5 + x = -1.555634919 Solving 0.5 + x = -1.555634919 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -1.555634919 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -1.555634919 + -0.5 x = -1.555634919 + -0.5 Combine like terms: -1.555634919 + -0.5 = -2.055634919 x = -2.055634919 Simplifying x = -2.055634919

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.055634919, -2.055634919}

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