x^2-4x=286

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Solution for x^2-4x=286 equation:


Simplifying
x2 + -4x = 286

Reorder the terms:
-4x + x2 = 286

Solving
-4x + x2 = 286

Solving for variable 'x'.

Reorder the terms:
-286 + -4x + x2 = 286 + -286

Combine like terms: 286 + -286 = 0
-286 + -4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '286' to each side of the equation.
-286 + -4x + 286 + x2 = 0 + 286

Reorder the terms:
-286 + 286 + -4x + x2 = 0 + 286

Combine like terms: -286 + 286 = 0
0 + -4x + x2 = 0 + 286
-4x + x2 = 0 + 286

Combine like terms: 0 + 286 = 286
-4x + x2 = 286

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x + 4 + x2 = 286 + 4

Reorder the terms:
4 + -4x + x2 = 286 + 4

Combine like terms: 286 + 4 = 290
4 + -4x + x2 = 290

Factor a perfect square on the left side:
(x + -2)(x + -2) = 290

Calculate the square root of the right side: 17.029386366

Break this problem into two subproblems by setting 
(x + -2) equal to 17.029386366 and -17.029386366.

Subproblem 1

x + -2 = 17.029386366 Simplifying x + -2 = 17.029386366 Reorder the terms: -2 + x = 17.029386366 Solving -2 + x = 17.029386366 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = 17.029386366 + 2 Combine like terms: -2 + 2 = 0 0 + x = 17.029386366 + 2 x = 17.029386366 + 2 Combine like terms: 17.029386366 + 2 = 19.029386366 x = 19.029386366 Simplifying x = 19.029386366

Subproblem 2

x + -2 = -17.029386366 Simplifying x + -2 = -17.029386366 Reorder the terms: -2 + x = -17.029386366 Solving -2 + x = -17.029386366 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = -17.029386366 + 2 Combine like terms: -2 + 2 = 0 0 + x = -17.029386366 + 2 x = -17.029386366 + 2 Combine like terms: -17.029386366 + 2 = -15.029386366 x = -15.029386366 Simplifying x = -15.029386366

Solution

The solution to the problem is based on the solutions from the subproblems. x = {19.029386366, -15.029386366}

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