x(x-5)=56

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Solution for x(x-5)=56 equation:


Simplifying
x(x + -5) = 56

Reorder the terms:
x(-5 + x) = 56
(-5 * x + x * x) = 56
(-5x + x2) = 56

Solving
-5x + x2 = 56

Solving for variable 'x'.

Reorder the terms:
-56 + -5x + x2 = 56 + -56

Combine like terms: 56 + -56 = 0
-56 + -5x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '56' to each side of the equation.
-56 + -5x + 56 + x2 = 0 + 56

Reorder the terms:
-56 + 56 + -5x + x2 = 0 + 56

Combine like terms: -56 + 56 = 0
0 + -5x + x2 = 0 + 56
-5x + x2 = 0 + 56

Combine like terms: 0 + 56 = 56
-5x + x2 = 56

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = 56 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 56 + 6.25

Combine like terms: 56 + 6.25 = 62.25
6.25 + -5x + x2 = 62.25

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 62.25

Calculate the square root of the right side: 7.889866919

Break this problem into two subproblems by setting 
(x + -2.5) equal to 7.889866919 and -7.889866919.

Subproblem 1

x + -2.5 = 7.889866919 Simplifying x + -2.5 = 7.889866919 Reorder the terms: -2.5 + x = 7.889866919 Solving -2.5 + x = 7.889866919 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = 7.889866919 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 7.889866919 + 2.5 x = 7.889866919 + 2.5 Combine like terms: 7.889866919 + 2.5 = 10.389866919 x = 10.389866919 Simplifying x = 10.389866919

Subproblem 2

x + -2.5 = -7.889866919 Simplifying x + -2.5 = -7.889866919 Reorder the terms: -2.5 + x = -7.889866919 Solving -2.5 + x = -7.889866919 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = -7.889866919 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -7.889866919 + 2.5 x = -7.889866919 + 2.5 Combine like terms: -7.889866919 + 2.5 = -5.389866919 x = -5.389866919 Simplifying x = -5.389866919

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.389866919, -5.389866919}

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