x^2-12.56x+6.67=0

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Solution for x^2-12.56x+6.67=0 equation:


Simplifying
x2 + -12.56x + 6.67 = 0

Reorder the terms:
6.67 + -12.56x + x2 = 0

Solving
6.67 + -12.56x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-6.67' to each side of the equation.
6.67 + -12.56x + -6.67 + x2 = 0 + -6.67

Reorder the terms:
6.67 + -6.67 + -12.56x + x2 = 0 + -6.67

Combine like terms: 6.67 + -6.67 = 0.00
0.00 + -12.56x + x2 = 0 + -6.67
-12.56x + x2 = 0 + -6.67

Combine like terms: 0 + -6.67 = -6.67
-12.56x + x2 = -6.67

The x term is -12.56x.  Take half its coefficient (-6.28).
Square it (39.4384) and add it to both sides.

Add '39.4384' to each side of the equation.
-12.56x + 39.4384 + x2 = -6.67 + 39.4384

Reorder the terms:
39.4384 + -12.56x + x2 = -6.67 + 39.4384

Combine like terms: -6.67 + 39.4384 = 32.7684
39.4384 + -12.56x + x2 = 32.7684

Factor a perfect square on the left side:
(x + -6.28)(x + -6.28) = 32.7684

Calculate the square root of the right side: 5.724368961

Break this problem into two subproblems by setting 
(x + -6.28) equal to 5.724368961 and -5.724368961.

Subproblem 1

x + -6.28 = 5.724368961 Simplifying x + -6.28 = 5.724368961 Reorder the terms: -6.28 + x = 5.724368961 Solving -6.28 + x = 5.724368961 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.28' to each side of the equation. -6.28 + 6.28 + x = 5.724368961 + 6.28 Combine like terms: -6.28 + 6.28 = 0.00 0.00 + x = 5.724368961 + 6.28 x = 5.724368961 + 6.28 Combine like terms: 5.724368961 + 6.28 = 12.004368961 x = 12.004368961 Simplifying x = 12.004368961

Subproblem 2

x + -6.28 = -5.724368961 Simplifying x + -6.28 = -5.724368961 Reorder the terms: -6.28 + x = -5.724368961 Solving -6.28 + x = -5.724368961 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.28' to each side of the equation. -6.28 + 6.28 + x = -5.724368961 + 6.28 Combine like terms: -6.28 + 6.28 = 0.00 0.00 + x = -5.724368961 + 6.28 x = -5.724368961 + 6.28 Combine like terms: -5.724368961 + 6.28 = 0.555631039 x = 0.555631039 Simplifying x = 0.555631039

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.004368961, 0.555631039}

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