0=x^2-1.998x+0.998

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Solution for 0=x^2-1.998x+0.998 equation:


Simplifying
0 = x2 + -1.998x + 0.998

Reorder the terms:
0 = 0.998 + -1.998x + x2

Solving
0 = 0.998 + -1.998x + x2

Solving for variable 'x'.

Combine like terms: 0 + -0.998 = -0.998
-0.998 + 1.998x + -1x2 = 0.998 + -1.998x + x2 + -0.998 + 1.998x + -1x2

Reorder the terms:
-0.998 + 1.998x + -1x2 = 0.998 + -0.998 + -1.998x + 1.998x + x2 + -1x2

Combine like terms: 0.998 + -0.998 = 0.000
-0.998 + 1.998x + -1x2 = 0.000 + -1.998x + 1.998x + x2 + -1x2
-0.998 + 1.998x + -1x2 = -1.998x + 1.998x + x2 + -1x2

Combine like terms: -1.998x + 1.998x = 0.000
-0.998 + 1.998x + -1x2 = 0.000 + x2 + -1x2
-0.998 + 1.998x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-0.998 + 1.998x + -1x2 = 0

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

Divide each side by '-1'.
0.998 + -1.998x + x2 = 0

Move the constant term to the right:

Add '-0.998' to each side of the equation.
0.998 + -1.998x + -0.998 + x2 = 0 + -0.998

Reorder the terms:
0.998 + -0.998 + -1.998x + x2 = 0 + -0.998

Combine like terms: 0.998 + -0.998 = 0.000
0.000 + -1.998x + x2 = 0 + -0.998
-1.998x + x2 = 0 + -0.998

Combine like terms: 0 + -0.998 = -0.998
-1.998x + x2 = -0.998

The x term is -1.998x.  Take half its coefficient (-0.999).
Square it (0.998001) and add it to both sides.

Add '0.998001' to each side of the equation.
-1.998x + 0.998001 + x2 = -0.998 + 0.998001

Reorder the terms:
0.998001 + -1.998x + x2 = -0.998 + 0.998001

Combine like terms: -0.998 + 0.998001 = 0.000001
0.998001 + -1.998x + x2 = 0.000001

Factor a perfect square on the left side:
(x + -0.999)(x + -0.999) = 0.000001

Calculate the square root of the right side: 0.001

Break this problem into two subproblems by setting 
(x + -0.999) equal to 0.001 and -0.001.

Subproblem 1

x + -0.999 = 0.001 Simplifying x + -0.999 = 0.001 Reorder the terms: -0.999 + x = 0.001 Solving -0.999 + x = 0.001 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.999' to each side of the equation. -0.999 + 0.999 + x = 0.001 + 0.999 Combine like terms: -0.999 + 0.999 = 0.000 0.000 + x = 0.001 + 0.999 x = 0.001 + 0.999 Combine like terms: 0.001 + 0.999 = 1 x = 1 Simplifying x = 1

Subproblem 2

x + -0.999 = -0.001 Simplifying x + -0.999 = -0.001 Reorder the terms: -0.999 + x = -0.001 Solving -0.999 + x = -0.001 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.999' to each side of the equation. -0.999 + 0.999 + x = -0.001 + 0.999 Combine like terms: -0.999 + 0.999 = 0.000 0.000 + x = -0.001 + 0.999 x = -0.001 + 0.999 Combine like terms: -0.001 + 0.999 = 0.998 x = 0.998 Simplifying x = 0.998

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1, 0.998}

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