2x-x^2-0.9=0

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Solution for 2x-x^2-0.9=0 equation:


Simplifying
2x + -1x2 + -0.9 = 0

Reorder the terms:
-0.9 + 2x + -1x2 = 0

Solving
-0.9 + 2x + -1x2 = 0

Solving for variable 'x'.

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

Divide each side by '-1'.
0.9 + -2x + x2 = 0

Move the constant term to the right:

Add '-0.9' to each side of the equation.
0.9 + -2x + -0.9 + x2 = 0 + -0.9

Reorder the terms:
0.9 + -0.9 + -2x + x2 = 0 + -0.9

Combine like terms: 0.9 + -0.9 = 0.0
0.0 + -2x + x2 = 0 + -0.9
-2x + x2 = 0 + -0.9

Combine like terms: 0 + -0.9 = -0.9
-2x + x2 = -0.9

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 = -0.9 + 1

Reorder the terms:
1 + -2x + x2 = -0.9 + 1

Combine like terms: -0.9 + 1 = 0.1
1 + -2x + x2 = 0.1

Factor a perfect square on the left side:
(x + -1)(x + -1) = 0.1

Calculate the square root of the right side: 0.316227766

Break this problem into two subproblems by setting 
(x + -1) equal to 0.316227766 and -0.316227766.

Subproblem 1

x + -1 = 0.316227766 Simplifying x + -1 = 0.316227766 Reorder the terms: -1 + x = 0.316227766 Solving -1 + x = 0.316227766 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 = 0.316227766 + 1 Combine like terms: -1 + 1 = 0 0 + x = 0.316227766 + 1 x = 0.316227766 + 1 Combine like terms: 0.316227766 + 1 = 1.316227766 x = 1.316227766 Simplifying x = 1.316227766

Subproblem 2

x + -1 = -0.316227766 Simplifying x + -1 = -0.316227766 Reorder the terms: -1 + x = -0.316227766 Solving -1 + x = -0.316227766 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 = -0.316227766 + 1 Combine like terms: -1 + 1 = 0 0 + x = -0.316227766 + 1 x = -0.316227766 + 1 Combine like terms: -0.316227766 + 1 = 0.683772234 x = 0.683772234 Simplifying x = 0.683772234

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.316227766, 0.683772234}

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