3x+2x^2-208=0

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Solution for 3x+2x^2-208=0 equation:


Simplifying
3x + 2x2 + -208 = 0

Reorder the terms:
-208 + 3x + 2x2 = 0

Solving
-208 + 3x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-104 + 1.5x + x2 = 0

Move the constant term to the right:

Add '104' to each side of the equation.
-104 + 1.5x + 104 + x2 = 0 + 104

Reorder the terms:
-104 + 104 + 1.5x + x2 = 0 + 104

Combine like terms: -104 + 104 = 0
0 + 1.5x + x2 = 0 + 104
1.5x + x2 = 0 + 104

Combine like terms: 0 + 104 = 104
1.5x + x2 = 104

The x term is 1.5x.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5x + 0.5625 + x2 = 104 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = 104 + 0.5625

Combine like terms: 104 + 0.5625 = 104.5625
0.5625 + 1.5x + x2 = 104.5625

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 104.5625

Calculate the square root of the right side: 10.225580668

Break this problem into two subproblems by setting 
(x + 0.75) equal to 10.225580668 and -10.225580668.

Subproblem 1

x + 0.75 = 10.225580668 Simplifying x + 0.75 = 10.225580668 Reorder the terms: 0.75 + x = 10.225580668 Solving 0.75 + x = 10.225580668 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = 10.225580668 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 10.225580668 + -0.75 x = 10.225580668 + -0.75 Combine like terms: 10.225580668 + -0.75 = 9.475580668 x = 9.475580668 Simplifying x = 9.475580668

Subproblem 2

x + 0.75 = -10.225580668 Simplifying x + 0.75 = -10.225580668 Reorder the terms: 0.75 + x = -10.225580668 Solving 0.75 + x = -10.225580668 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = -10.225580668 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -10.225580668 + -0.75 x = -10.225580668 + -0.75 Combine like terms: -10.225580668 + -0.75 = -10.975580668 x = -10.975580668 Simplifying x = -10.975580668

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.475580668, -10.975580668}

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