.5(x+6)(x)-56=0

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Solution for .5(x+6)(x)-56=0 equation:


Simplifying
0.5(x + 6)(x) + -56 = 0

Reorder the terms:
0.5(6 + x)(x) + -56 = 0

Reorder the terms for easier multiplication:
0.5x(6 + x) + -56 = 0
(6 * 0.5x + x * 0.5x) + -56 = 0
(3x + 0.5x2) + -56 = 0

Reorder the terms:
-56 + 3x + 0.5x2 = 0

Solving
-56 + 3x + 0.5x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.5'.
-112 + 6x + x2 = 0

Move the constant term to the right:

Add '112' to each side of the equation.
-112 + 6x + 112 + x2 = 0 + 112

Reorder the terms:
-112 + 112 + 6x + x2 = 0 + 112

Combine like terms: -112 + 112 = 0
0 + 6x + x2 = 0 + 112
6x + x2 = 0 + 112

Combine like terms: 0 + 112 = 112
6x + x2 = 112

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 = 112 + 9

Reorder the terms:
9 + 6x + x2 = 112 + 9

Combine like terms: 112 + 9 = 121
9 + 6x + x2 = 121

Factor a perfect square on the left side:
(x + 3)(x + 3) = 121

Calculate the square root of the right side: 11

Break this problem into two subproblems by setting 
(x + 3) equal to 11 and -11.

Subproblem 1

x + 3 = 11 Simplifying x + 3 = 11 Reorder the terms: 3 + x = 11 Solving 3 + x = 11 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 = 11 + -3 Combine like terms: 3 + -3 = 0 0 + x = 11 + -3 x = 11 + -3 Combine like terms: 11 + -3 = 8 x = 8 Simplifying x = 8

Subproblem 2

x + 3 = -11 Simplifying x + 3 = -11 Reorder the terms: 3 + x = -11 Solving 3 + x = -11 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 = -11 + -3 Combine like terms: 3 + -3 = 0 0 + x = -11 + -3 x = -11 + -3 Combine like terms: -11 + -3 = -14 x = -14 Simplifying x = -14

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8, -14}

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