-1.3-.8x+x^2=0

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Solution for -1.3-.8x+x^2=0 equation:


Simplifying
-1.3 + -0.8x + x2 = 0

Solving
-1.3 + -0.8x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '1.3' to each side of the equation.
-1.3 + -0.8x + 1.3 + x2 = 0 + 1.3

Reorder the terms:
-1.3 + 1.3 + -0.8x + x2 = 0 + 1.3

Combine like terms: -1.3 + 1.3 = 0.0
0.0 + -0.8x + x2 = 0 + 1.3
-0.8x + x2 = 0 + 1.3

Combine like terms: 0 + 1.3 = 1.3
-0.8x + x2 = 1.3

The x term is -0.8x.  Take half its coefficient (-0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
-0.8x + 0.16 + x2 = 1.3 + 0.16

Reorder the terms:
0.16 + -0.8x + x2 = 1.3 + 0.16

Combine like terms: 1.3 + 0.16 = 1.46
0.16 + -0.8x + x2 = 1.46

Factor a perfect square on the left side:
(x + -0.4)(x + -0.4) = 1.46

Calculate the square root of the right side: 1.208304597

Break this problem into two subproblems by setting 
(x + -0.4) equal to 1.208304597 and -1.208304597.

Subproblem 1

x + -0.4 = 1.208304597 Simplifying x + -0.4 = 1.208304597 Reorder the terms: -0.4 + x = 1.208304597 Solving -0.4 + x = 1.208304597 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4' to each side of the equation. -0.4 + 0.4 + x = 1.208304597 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + x = 1.208304597 + 0.4 x = 1.208304597 + 0.4 Combine like terms: 1.208304597 + 0.4 = 1.608304597 x = 1.608304597 Simplifying x = 1.608304597

Subproblem 2

x + -0.4 = -1.208304597 Simplifying x + -0.4 = -1.208304597 Reorder the terms: -0.4 + x = -1.208304597 Solving -0.4 + x = -1.208304597 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4' to each side of the equation. -0.4 + 0.4 + x = -1.208304597 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + x = -1.208304597 + 0.4 x = -1.208304597 + 0.4 Combine like terms: -1.208304597 + 0.4 = -0.808304597 x = -0.808304597 Simplifying x = -0.808304597

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.608304597, -0.808304597}

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