x^2-x-.28=0

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Solution for x^2-x-.28=0 equation:


Simplifying
x2 + -1x + -0.28 = 0

Reorder the terms:
-0.28 + -1x + x2 = 0

Solving
-0.28 + -1x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '0.28' to each side of the equation.
-0.28 + -1x + 0.28 + x2 = 0 + 0.28

Reorder the terms:
-0.28 + 0.28 + -1x + x2 = 0 + 0.28

Combine like terms: -0.28 + 0.28 = 0.00
0.00 + -1x + x2 = 0 + 0.28
-1x + x2 = 0 + 0.28

Combine like terms: 0 + 0.28 = 0.28
-1x + x2 = 0.28

The x term is -1x.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1x + 0.25 + x2 = 0.28 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 0.28 + 0.25

Combine like terms: 0.28 + 0.25 = 0.53
0.25 + -1x + x2 = 0.53

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 0.53

Calculate the square root of the right side: 0.728010989

Break this problem into two subproblems by setting 
(x + -0.5) equal to 0.728010989 and -0.728010989.

Subproblem 1

x + -0.5 = 0.728010989 Simplifying x + -0.5 = 0.728010989 Reorder the terms: -0.5 + x = 0.728010989 Solving -0.5 + x = 0.728010989 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = 0.728010989 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 0.728010989 + 0.5 x = 0.728010989 + 0.5 Combine like terms: 0.728010989 + 0.5 = 1.228010989 x = 1.228010989 Simplifying x = 1.228010989

Subproblem 2

x + -0.5 = -0.728010989 Simplifying x + -0.5 = -0.728010989 Reorder the terms: -0.5 + x = -0.728010989 Solving -0.5 + x = -0.728010989 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = -0.728010989 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -0.728010989 + 0.5 x = -0.728010989 + 0.5 Combine like terms: -0.728010989 + 0.5 = -0.228010989 x = -0.228010989 Simplifying x = -0.228010989

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.228010989, -0.228010989}

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