6x=129.6-x^2

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Solution for 6x=129.6-x^2 equation:


Simplifying
6x = 129.6 + -1x2

Solving
6x = 129.6 + -1x2

Solving for variable 'x'.

Reorder the terms:
-129.6 + 6x + x2 = 129.6 + -1x2 + -129.6 + x2

Reorder the terms:
-129.6 + 6x + x2 = 129.6 + -129.6 + -1x2 + x2

Combine like terms: 129.6 + -129.6 = 0.0
-129.6 + 6x + x2 = 0.0 + -1x2 + x2
-129.6 + 6x + x2 = -1x2 + x2

Combine like terms: -1x2 + x2 = 0
-129.6 + 6x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '129.6' to each side of the equation.
-129.6 + 6x + 129.6 + x2 = 0 + 129.6

Reorder the terms:
-129.6 + 129.6 + 6x + x2 = 0 + 129.6

Combine like terms: -129.6 + 129.6 = 0.0
0.0 + 6x + x2 = 0 + 129.6
6x + x2 = 0 + 129.6

Combine like terms: 0 + 129.6 = 129.6
6x + x2 = 129.6

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 = 129.6 + 9

Reorder the terms:
9 + 6x + x2 = 129.6 + 9

Combine like terms: 129.6 + 9 = 138.6
9 + 6x + x2 = 138.6

Factor a perfect square on the left side:
(x + 3)(x + 3) = 138.6

Calculate the square root of the right side: 11.772850122

Break this problem into two subproblems by setting 
(x + 3) equal to 11.772850122 and -11.772850122.

Subproblem 1

x + 3 = 11.772850122 Simplifying x + 3 = 11.772850122 Reorder the terms: 3 + x = 11.772850122 Solving 3 + x = 11.772850122 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 = 11.772850122 + -3 Combine like terms: 3 + -3 = 0 0 + x = 11.772850122 + -3 x = 11.772850122 + -3 Combine like terms: 11.772850122 + -3 = 8.772850122 x = 8.772850122 Simplifying x = 8.772850122

Subproblem 2

x + 3 = -11.772850122 Simplifying x + 3 = -11.772850122 Reorder the terms: 3 + x = -11.772850122 Solving 3 + x = -11.772850122 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 = -11.772850122 + -3 Combine like terms: 3 + -3 = 0 0 + x = -11.772850122 + -3 x = -11.772850122 + -3 Combine like terms: -11.772850122 + -3 = -14.772850122 x = -14.772850122 Simplifying x = -14.772850122

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.772850122, -14.772850122}

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