260=.5(x)(x-6)

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Solution for 260=.5(x)(x-6) equation:


Simplifying
260 = 0.5(x)(x + -6)

Reorder the terms:
260 = 0.5x(-6 + x)
260 = (-6 * 0.5x + x * 0.5x)
260 = (-3x + 0.5x2)

Solving
260 = -3x + 0.5x2

Solving for variable 'x'.

Reorder the terms:
260 + 3x + -0.5x2 = -3x + 3x + 0.5x2 + -0.5x2

Combine like terms: -3x + 3x = 0
260 + 3x + -0.5x2 = 0 + 0.5x2 + -0.5x2
260 + 3x + -0.5x2 = 0.5x2 + -0.5x2

Combine like terms: 0.5x2 + -0.5x2 = 0.0
260 + 3x + -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'.
-520 + -6x + x2 = 0

Move the constant term to the right:

Add '520' to each side of the equation.
-520 + -6x + 520 + x2 = 0 + 520

Reorder the terms:
-520 + 520 + -6x + x2 = 0 + 520

Combine like terms: -520 + 520 = 0
0 + -6x + x2 = 0 + 520
-6x + x2 = 0 + 520

Combine like terms: 0 + 520 = 520
-6x + x2 = 520

The x term is -6x.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6x + 9 + x2 = 520 + 9

Reorder the terms:
9 + -6x + x2 = 520 + 9

Combine like terms: 520 + 9 = 529
9 + -6x + x2 = 529

Factor a perfect square on the left side:
(x + -3)(x + -3) = 529

Calculate the square root of the right side: 23

Break this problem into two subproblems by setting 
(x + -3) equal to 23 and -23.

Subproblem 1

x + -3 = 23 Simplifying x + -3 = 23 Reorder the terms: -3 + x = 23 Solving -3 + x = 23 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = 23 + 3 Combine like terms: -3 + 3 = 0 0 + x = 23 + 3 x = 23 + 3 Combine like terms: 23 + 3 = 26 x = 26 Simplifying x = 26

Subproblem 2

x + -3 = -23 Simplifying x + -3 = -23 Reorder the terms: -3 + x = -23 Solving -3 + x = -23 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = -23 + 3 Combine like terms: -3 + 3 = 0 0 + x = -23 + 3 x = -23 + 3 Combine like terms: -23 + 3 = -20 x = -20 Simplifying x = -20

Solution

The solution to the problem is based on the solutions from the subproblems. x = {26, -20}

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