x^2-2x-56=0

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


Simplifying
x2 + -2x + -56 = 0

Reorder the terms:
-56 + -2x + x2 = 0

Solving
-56 + -2x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '56' to each side of the equation.
-56 + -2x + 56 + x2 = 0 + 56

Reorder the terms:
-56 + 56 + -2x + x2 = 0 + 56

Combine like terms: -56 + 56 = 0
0 + -2x + x2 = 0 + 56
-2x + x2 = 0 + 56

Combine like terms: 0 + 56 = 56
-2x + x2 = 56

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = 56 + 1

Reorder the terms:
1 + -2x + x2 = 56 + 1

Combine like terms: 56 + 1 = 57
1 + -2x + x2 = 57

Factor a perfect square on the left side:
(x + -1)(x + -1) = 57

Calculate the square root of the right side: 7.549834435

Break this problem into two subproblems by setting 
(x + -1) equal to 7.549834435 and -7.549834435.

Subproblem 1

x + -1 = 7.549834435 Simplifying x + -1 = 7.549834435 Reorder the terms: -1 + x = 7.549834435 Solving -1 + x = 7.549834435 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 7.549834435 + 1 Combine like terms: -1 + 1 = 0 0 + x = 7.549834435 + 1 x = 7.549834435 + 1 Combine like terms: 7.549834435 + 1 = 8.549834435 x = 8.549834435 Simplifying x = 8.549834435

Subproblem 2

x + -1 = -7.549834435 Simplifying x + -1 = -7.549834435 Reorder the terms: -1 + x = -7.549834435 Solving -1 + x = -7.549834435 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -7.549834435 + 1 Combine like terms: -1 + 1 = 0 0 + x = -7.549834435 + 1 x = -7.549834435 + 1 Combine like terms: -7.549834435 + 1 = -6.549834435 x = -6.549834435 Simplifying x = -6.549834435

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.549834435, -6.549834435}

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