3x+6x^2=500

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Solution for 3x+6x^2=500 equation:


Simplifying
3x + 6x2 = 500

Solving
3x + 6x2 = 500

Solving for variable 'x'.

Reorder the terms:
-500 + 3x + 6x2 = 500 + -500

Combine like terms: 500 + -500 = 0
-500 + 3x + 6x2 = 0

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

Divide each side by '6'.
-83.33333333 + 0.5x + x2 = 0

Move the constant term to the right:

Add '83.33333333' to each side of the equation.
-83.33333333 + 0.5x + 83.33333333 + x2 = 0 + 83.33333333

Reorder the terms:
-83.33333333 + 83.33333333 + 0.5x + x2 = 0 + 83.33333333

Combine like terms: -83.33333333 + 83.33333333 = 0.00000000
0.00000000 + 0.5x + x2 = 0 + 83.33333333
0.5x + x2 = 0 + 83.33333333

Combine like terms: 0 + 83.33333333 = 83.33333333
0.5x + x2 = 83.33333333

The x term is 0.5x.  Take half its coefficient (0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
0.5x + 0.0625 + x2 = 83.33333333 + 0.0625

Reorder the terms:
0.0625 + 0.5x + x2 = 83.33333333 + 0.0625

Combine like terms: 83.33333333 + 0.0625 = 83.39583333
0.0625 + 0.5x + x2 = 83.39583333

Factor a perfect square on the left side:
(x + 0.25)(x + 0.25) = 83.39583333

Calculate the square root of the right side: 9.132131916

Break this problem into two subproblems by setting 
(x + 0.25) equal to 9.132131916 and -9.132131916.

Subproblem 1

x + 0.25 = 9.132131916 Simplifying x + 0.25 = 9.132131916 Reorder the terms: 0.25 + x = 9.132131916 Solving 0.25 + x = 9.132131916 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = 9.132131916 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = 9.132131916 + -0.25 x = 9.132131916 + -0.25 Combine like terms: 9.132131916 + -0.25 = 8.882131916 x = 8.882131916 Simplifying x = 8.882131916

Subproblem 2

x + 0.25 = -9.132131916 Simplifying x + 0.25 = -9.132131916 Reorder the terms: 0.25 + x = -9.132131916 Solving 0.25 + x = -9.132131916 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = -9.132131916 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = -9.132131916 + -0.25 x = -9.132131916 + -0.25 Combine like terms: -9.132131916 + -0.25 = -9.382131916 x = -9.382131916 Simplifying x = -9.382131916

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.882131916, -9.382131916}

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