0=x^2-2x-1.89

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Solution for 0=x^2-2x-1.89 equation:


Simplifying
0 = x2 + -2x + -1.89

Reorder the terms:
0 = -1.89 + -2x + x2

Solving
0 = -1.89 + -2x + x2

Solving for variable 'x'.

Combine like terms: 0 + 1.89 = 1.89
1.89 + 2x + -1x2 = -1.89 + -2x + x2 + 1.89 + 2x + -1x2

Reorder the terms:
1.89 + 2x + -1x2 = -1.89 + 1.89 + -2x + 2x + x2 + -1x2

Combine like terms: -1.89 + 1.89 = 0.00
1.89 + 2x + -1x2 = 0.00 + -2x + 2x + x2 + -1x2
1.89 + 2x + -1x2 = -2x + 2x + x2 + -1x2

Combine like terms: -2x + 2x = 0
1.89 + 2x + -1x2 = 0 + x2 + -1x2
1.89 + 2x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
1.89 + 2x + -1x2 = 0

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

Divide each side by '-1'.
-1.89 + -2x + x2 = 0

Move the constant term to the right:

Add '1.89' to each side of the equation.
-1.89 + -2x + 1.89 + x2 = 0 + 1.89

Reorder the terms:
-1.89 + 1.89 + -2x + x2 = 0 + 1.89

Combine like terms: -1.89 + 1.89 = 0.00
0.00 + -2x + x2 = 0 + 1.89
-2x + x2 = 0 + 1.89

Combine like terms: 0 + 1.89 = 1.89
-2x + x2 = 1.89

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 = 1.89 + 1

Reorder the terms:
1 + -2x + x2 = 1.89 + 1

Combine like terms: 1.89 + 1 = 2.89
1 + -2x + x2 = 2.89

Factor a perfect square on the left side:
(x + -1)(x + -1) = 2.89

Calculate the square root of the right side: 1.7

Break this problem into two subproblems by setting 
(x + -1) equal to 1.7 and -1.7.

Subproblem 1

x + -1 = 1.7 Simplifying x + -1 = 1.7 Reorder the terms: -1 + x = 1.7 Solving -1 + x = 1.7 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 = 1.7 + 1 Combine like terms: -1 + 1 = 0 0 + x = 1.7 + 1 x = 1.7 + 1 Combine like terms: 1.7 + 1 = 2.7 x = 2.7 Simplifying x = 2.7

Subproblem 2

x + -1 = -1.7 Simplifying x + -1 = -1.7 Reorder the terms: -1 + x = -1.7 Solving -1 + x = -1.7 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 = -1.7 + 1 Combine like terms: -1 + 1 = 0 0 + x = -1.7 + 1 x = -1.7 + 1 Combine like terms: -1.7 + 1 = -0.7 x = -0.7 Simplifying x = -0.7

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.7, -0.7}

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