6=0.5x^2+6x-9

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Solution for 6=0.5x^2+6x-9 equation:


Simplifying
6 = 0.5x2 + 6x + -9

Reorder the terms:
6 = -9 + 6x + 0.5x2

Solving
6 = -9 + 6x + 0.5x2

Solving for variable 'x'.

Combine like terms: 6 + 9 = 15
15 + -6x + -0.5x2 = -9 + 6x + 0.5x2 + 9 + -6x + -0.5x2

Reorder the terms:
15 + -6x + -0.5x2 = -9 + 9 + 6x + -6x + 0.5x2 + -0.5x2

Combine like terms: -9 + 9 = 0
15 + -6x + -0.5x2 = 0 + 6x + -6x + 0.5x2 + -0.5x2
15 + -6x + -0.5x2 = 6x + -6x + 0.5x2 + -0.5x2

Combine like terms: 6x + -6x = 0
15 + -6x + -0.5x2 = 0 + 0.5x2 + -0.5x2
15 + -6x + -0.5x2 = 0.5x2 + -0.5x2

Combine like terms: 0.5x2 + -0.5x2 = 0.0
15 + -6x + -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'.
-30 + 12x + x2 = 0

Move the constant term to the right:

Add '30' to each side of the equation.
-30 + 12x + 30 + x2 = 0 + 30

Reorder the terms:
-30 + 30 + 12x + x2 = 0 + 30

Combine like terms: -30 + 30 = 0
0 + 12x + x2 = 0 + 30
12x + x2 = 0 + 30

Combine like terms: 0 + 30 = 30
12x + x2 = 30

The x term is 12x.  Take half its coefficient (6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
12x + 36 + x2 = 30 + 36

Reorder the terms:
36 + 12x + x2 = 30 + 36

Combine like terms: 30 + 36 = 66
36 + 12x + x2 = 66

Factor a perfect square on the left side:
(x + 6)(x + 6) = 66

Calculate the square root of the right side: 8.124038405

Break this problem into two subproblems by setting 
(x + 6) equal to 8.124038405 and -8.124038405.

Subproblem 1

x + 6 = 8.124038405 Simplifying x + 6 = 8.124038405 Reorder the terms: 6 + x = 8.124038405 Solving 6 + x = 8.124038405 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = 8.124038405 + -6 Combine like terms: 6 + -6 = 0 0 + x = 8.124038405 + -6 x = 8.124038405 + -6 Combine like terms: 8.124038405 + -6 = 2.124038405 x = 2.124038405 Simplifying x = 2.124038405

Subproblem 2

x + 6 = -8.124038405 Simplifying x + 6 = -8.124038405 Reorder the terms: 6 + x = -8.124038405 Solving 6 + x = -8.124038405 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = -8.124038405 + -6 Combine like terms: 6 + -6 = 0 0 + x = -8.124038405 + -6 x = -8.124038405 + -6 Combine like terms: -8.124038405 + -6 = -14.124038405 x = -14.124038405 Simplifying x = -14.124038405

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.124038405, -14.124038405}

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