x^2-56x+216=0

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Solution for x^2-56x+216=0 equation:


Simplifying
x2 + -56x + 216 = 0

Reorder the terms:
216 + -56x + x2 = 0

Solving
216 + -56x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-216' to each side of the equation.
216 + -56x + -216 + x2 = 0 + -216

Reorder the terms:
216 + -216 + -56x + x2 = 0 + -216

Combine like terms: 216 + -216 = 0
0 + -56x + x2 = 0 + -216
-56x + x2 = 0 + -216

Combine like terms: 0 + -216 = -216
-56x + x2 = -216

The x term is -56x.  Take half its coefficient (-28).
Square it (784) and add it to both sides.

Add '784' to each side of the equation.
-56x + 784 + x2 = -216 + 784

Reorder the terms:
784 + -56x + x2 = -216 + 784

Combine like terms: -216 + 784 = 568
784 + -56x + x2 = 568

Factor a perfect square on the left side:
(x + -28)(x + -28) = 568

Calculate the square root of the right side: 23.832750576

Break this problem into two subproblems by setting 
(x + -28) equal to 23.832750576 and -23.832750576.

Subproblem 1

x + -28 = 23.832750576 Simplifying x + -28 = 23.832750576 Reorder the terms: -28 + x = 23.832750576 Solving -28 + x = 23.832750576 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '28' to each side of the equation. -28 + 28 + x = 23.832750576 + 28 Combine like terms: -28 + 28 = 0 0 + x = 23.832750576 + 28 x = 23.832750576 + 28 Combine like terms: 23.832750576 + 28 = 51.832750576 x = 51.832750576 Simplifying x = 51.832750576

Subproblem 2

x + -28 = -23.832750576 Simplifying x + -28 = -23.832750576 Reorder the terms: -28 + x = -23.832750576 Solving -28 + x = -23.832750576 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '28' to each side of the equation. -28 + 28 + x = -23.832750576 + 28 Combine like terms: -28 + 28 = 0 0 + x = -23.832750576 + 28 x = -23.832750576 + 28 Combine like terms: -23.832750576 + 28 = 4.167249424 x = 4.167249424 Simplifying x = 4.167249424

Solution

The solution to the problem is based on the solutions from the subproblems. x = {51.832750576, 4.167249424}

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