x^2-22x+66=0

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Solution for x^2-22x+66=0 equation:


Simplifying
x2 + -22x + 66 = 0

Reorder the terms:
66 + -22x + x2 = 0

Solving
66 + -22x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-66' to each side of the equation.
66 + -22x + -66 + x2 = 0 + -66

Reorder the terms:
66 + -66 + -22x + x2 = 0 + -66

Combine like terms: 66 + -66 = 0
0 + -22x + x2 = 0 + -66
-22x + x2 = 0 + -66

Combine like terms: 0 + -66 = -66
-22x + x2 = -66

The x term is -22x.  Take half its coefficient (-11).
Square it (121) and add it to both sides.

Add '121' to each side of the equation.
-22x + 121 + x2 = -66 + 121

Reorder the terms:
121 + -22x + x2 = -66 + 121

Combine like terms: -66 + 121 = 55
121 + -22x + x2 = 55

Factor a perfect square on the left side:
(x + -11)(x + -11) = 55

Calculate the square root of the right side: 7.416198487

Break this problem into two subproblems by setting 
(x + -11) equal to 7.416198487 and -7.416198487.

Subproblem 1

x + -11 = 7.416198487 Simplifying x + -11 = 7.416198487 Reorder the terms: -11 + x = 7.416198487 Solving -11 + x = 7.416198487 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '11' to each side of the equation. -11 + 11 + x = 7.416198487 + 11 Combine like terms: -11 + 11 = 0 0 + x = 7.416198487 + 11 x = 7.416198487 + 11 Combine like terms: 7.416198487 + 11 = 18.416198487 x = 18.416198487 Simplifying x = 18.416198487

Subproblem 2

x + -11 = -7.416198487 Simplifying x + -11 = -7.416198487 Reorder the terms: -11 + x = -7.416198487 Solving -11 + x = -7.416198487 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '11' to each side of the equation. -11 + 11 + x = -7.416198487 + 11 Combine like terms: -11 + 11 = 0 0 + x = -7.416198487 + 11 x = -7.416198487 + 11 Combine like terms: -7.416198487 + 11 = 3.583801513 x = 3.583801513 Simplifying x = 3.583801513

Solution

The solution to the problem is based on the solutions from the subproblems. x = {18.416198487, 3.583801513}

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