28-56x=x^2

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Solution for 28-56x=x^2 equation:


Simplifying
28 + -56x = x2

Solving
28 + -56x = x2

Solving for variable 'x'.

Combine like terms: x2 + -1x2 = 0
28 + -56x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-28 + 56x + x2 = 0

Move the constant term to the right:

Add '28' to each side of the equation.
-28 + 56x + 28 + x2 = 0 + 28

Reorder the terms:
-28 + 28 + 56x + x2 = 0 + 28

Combine like terms: -28 + 28 = 0
0 + 56x + x2 = 0 + 28
56x + x2 = 0 + 28

Combine like terms: 0 + 28 = 28
56x + x2 = 28

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 = 28 + 784

Reorder the terms:
784 + 56x + x2 = 28 + 784

Combine like terms: 28 + 784 = 812
784 + 56x + x2 = 812

Factor a perfect square on the left side:
(x + 28)(x + 28) = 812

Calculate the square root of the right side: 28.495613698

Break this problem into two subproblems by setting 
(x + 28) equal to 28.495613698 and -28.495613698.

Subproblem 1

x + 28 = 28.495613698 Simplifying x + 28 = 28.495613698 Reorder the terms: 28 + x = 28.495613698 Solving 28 + x = 28.495613698 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 = 28.495613698 + -28 Combine like terms: 28 + -28 = 0 0 + x = 28.495613698 + -28 x = 28.495613698 + -28 Combine like terms: 28.495613698 + -28 = 0.495613698 x = 0.495613698 Simplifying x = 0.495613698

Subproblem 2

x + 28 = -28.495613698 Simplifying x + 28 = -28.495613698 Reorder the terms: 28 + x = -28.495613698 Solving 28 + x = -28.495613698 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 = -28.495613698 + -28 Combine like terms: 28 + -28 = 0 0 + x = -28.495613698 + -28 x = -28.495613698 + -28 Combine like terms: -28.495613698 + -28 = -56.495613698 x = -56.495613698 Simplifying x = -56.495613698

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.495613698, -56.495613698}

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