50=1.9x+4.3x^2

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Solution for 50=1.9x+4.3x^2 equation:


Simplifying
50 = 1.9x + 4.3x2

Solving
50 = 1.9x + 4.3x2

Solving for variable 'x'.

Reorder the terms:
50 + -1.9x + -4.3x2 = 1.9x + -1.9x + 4.3x2 + -4.3x2

Combine like terms: 1.9x + -1.9x = 0.0
50 + -1.9x + -4.3x2 = 0.0 + 4.3x2 + -4.3x2
50 + -1.9x + -4.3x2 = 4.3x2 + -4.3x2

Combine like terms: 4.3x2 + -4.3x2 = 0.0
50 + -1.9x + -4.3x2 = 0.0

Begin completing the square.  Divide all terms by
-4.3 the coefficient of the squared term: 

Divide each side by '-4.3'.
-11.62790698 + 0.4418604651x + x2 = 0

Move the constant term to the right:

Add '11.62790698' to each side of the equation.
-11.62790698 + 0.4418604651x + 11.62790698 + x2 = 0 + 11.62790698

Reorder the terms:
-11.62790698 + 11.62790698 + 0.4418604651x + x2 = 0 + 11.62790698

Combine like terms: -11.62790698 + 11.62790698 = 0.00000000
0.00000000 + 0.4418604651x + x2 = 0 + 11.62790698
0.4418604651x + x2 = 0 + 11.62790698

Combine like terms: 0 + 11.62790698 = 11.62790698
0.4418604651x + x2 = 11.62790698

The x term is 0.4418604651x.  Take half its coefficient (0.2209302326).
Square it (0.04881016768) and add it to both sides.

Add '0.04881016768' to each side of the equation.
0.4418604651x + 0.04881016768 + x2 = 11.62790698 + 0.04881016768

Reorder the terms:
0.04881016768 + 0.4418604651x + x2 = 11.62790698 + 0.04881016768

Combine like terms: 11.62790698 + 0.04881016768 = 11.67671714768
0.04881016768 + 0.4418604651x + x2 = 11.67671714768

Factor a perfect square on the left side:
(x + 0.2209302326)(x + 0.2209302326) = 11.67671714768

Calculate the square root of the right side: 3.417121178

Break this problem into two subproblems by setting 
(x + 0.2209302326) equal to 3.417121178 and -3.417121178.

Subproblem 1

x + 0.2209302326 = 3.417121178 Simplifying x + 0.2209302326 = 3.417121178 Reorder the terms: 0.2209302326 + x = 3.417121178 Solving 0.2209302326 + x = 3.417121178 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2209302326' to each side of the equation. 0.2209302326 + -0.2209302326 + x = 3.417121178 + -0.2209302326 Combine like terms: 0.2209302326 + -0.2209302326 = 0.0000000000 0.0000000000 + x = 3.417121178 + -0.2209302326 x = 3.417121178 + -0.2209302326 Combine like terms: 3.417121178 + -0.2209302326 = 3.1961909454 x = 3.1961909454 Simplifying x = 3.1961909454

Subproblem 2

x + 0.2209302326 = -3.417121178 Simplifying x + 0.2209302326 = -3.417121178 Reorder the terms: 0.2209302326 + x = -3.417121178 Solving 0.2209302326 + x = -3.417121178 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2209302326' to each side of the equation. 0.2209302326 + -0.2209302326 + x = -3.417121178 + -0.2209302326 Combine like terms: 0.2209302326 + -0.2209302326 = 0.0000000000 0.0000000000 + x = -3.417121178 + -0.2209302326 x = -3.417121178 + -0.2209302326 Combine like terms: -3.417121178 + -0.2209302326 = -3.6380514106 x = -3.6380514106 Simplifying x = -3.6380514106

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.1961909454, -3.6380514106}

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