286=x(.5x+2)

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Solution for 286=x(.5x+2) equation:


Simplifying
286 = x(0.5x + 2)

Reorder the terms:
286 = x(2 + 0.5x)
286 = (2 * x + 0.5x * x)
286 = (2x + 0.5x2)

Solving
286 = 2x + 0.5x2

Solving for variable 'x'.

Reorder the terms:
286 + -2x + -0.5x2 = 2x + -2x + 0.5x2 + -0.5x2

Combine like terms: 2x + -2x = 0
286 + -2x + -0.5x2 = 0 + 0.5x2 + -0.5x2
286 + -2x + -0.5x2 = 0.5x2 + -0.5x2

Combine like terms: 0.5x2 + -0.5x2 = 0.0
286 + -2x + -0.5x2 = 0.0

Begin completing the square.  Divide all terms by
-0.5 the coefficient of the squared term: 

Divide each side by '-0.5'.
-572 + 4x + x2 = 0

Move the constant term to the right:

Add '572' to each side of the equation.
-572 + 4x + 572 + x2 = 0 + 572

Reorder the terms:
-572 + 572 + 4x + x2 = 0 + 572

Combine like terms: -572 + 572 = 0
0 + 4x + x2 = 0 + 572
4x + x2 = 0 + 572

Combine like terms: 0 + 572 = 572
4x + x2 = 572

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 = 572 + 4

Reorder the terms:
4 + 4x + x2 = 572 + 4

Combine like terms: 572 + 4 = 576
4 + 4x + x2 = 576

Factor a perfect square on the left side:
(x + 2)(x + 2) = 576

Calculate the square root of the right side: 24

Break this problem into two subproblems by setting 
(x + 2) equal to 24 and -24.

Subproblem 1

x + 2 = 24 Simplifying x + 2 = 24 Reorder the terms: 2 + x = 24 Solving 2 + x = 24 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 = 24 + -2 Combine like terms: 2 + -2 = 0 0 + x = 24 + -2 x = 24 + -2 Combine like terms: 24 + -2 = 22 x = 22 Simplifying x = 22

Subproblem 2

x + 2 = -24 Simplifying x + 2 = -24 Reorder the terms: 2 + x = -24 Solving 2 + x = -24 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 = -24 + -2 Combine like terms: 2 + -2 = 0 0 + x = -24 + -2 x = -24 + -2 Combine like terms: -24 + -2 = -26 x = -26 Simplifying x = -26

Solution

The solution to the problem is based on the solutions from the subproblems. x = {22, -26}

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