2x-x^2=0.8

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Solution for 2x-x^2=0.8 equation:


Simplifying
2x + -1x2 = 0.8

Solving
2x + -1x2 = 0.8

Solving for variable 'x'.

Reorder the terms:
-0.8 + 2x + -1x2 = 0.8 + -0.8

Combine like terms: 0.8 + -0.8 = 0.0
-0.8 + 2x + -1x2 = 0.0

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

Divide each side by '-1'.
0.8 + -2x + x2 = 0.0

Move the constant term to the right:

Add '-0.8' to each side of the equation.
0.8 + -2x + -0.8 + x2 = 0.0 + -0.8

Reorder the terms:
0.8 + -0.8 + -2x + x2 = 0.0 + -0.8

Combine like terms: 0.8 + -0.8 = 0.0
0.0 + -2x + x2 = 0.0 + -0.8
-2x + x2 = 0.0 + -0.8

Combine like terms: 0.0 + -0.8 = -0.8
-2x + x2 = -0.8

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 = -0.8 + 1

Reorder the terms:
1 + -2x + x2 = -0.8 + 1

Combine like terms: -0.8 + 1 = 0.2
1 + -2x + x2 = 0.2

Factor a perfect square on the left side:
(x + -1)(x + -1) = 0.2

Calculate the square root of the right side: 0.447213596

Break this problem into two subproblems by setting 
(x + -1) equal to 0.447213596 and -0.447213596.

Subproblem 1

x + -1 = 0.447213596 Simplifying x + -1 = 0.447213596 Reorder the terms: -1 + x = 0.447213596 Solving -1 + x = 0.447213596 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 = 0.447213596 + 1 Combine like terms: -1 + 1 = 0 0 + x = 0.447213596 + 1 x = 0.447213596 + 1 Combine like terms: 0.447213596 + 1 = 1.447213596 x = 1.447213596 Simplifying x = 1.447213596

Subproblem 2

x + -1 = -0.447213596 Simplifying x + -1 = -0.447213596 Reorder the terms: -1 + x = -0.447213596 Solving -1 + x = -0.447213596 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 = -0.447213596 + 1 Combine like terms: -1 + 1 = 0 0 + x = -0.447213596 + 1 x = -0.447213596 + 1 Combine like terms: -0.447213596 + 1 = 0.552786404 x = 0.552786404 Simplifying x = 0.552786404

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.447213596, 0.552786404}

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