3x^2+4x=240

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Solution for 3x^2+4x=240 equation:


Simplifying
3x2 + 4x = 240

Reorder the terms:
4x + 3x2 = 240

Solving
4x + 3x2 = 240

Solving for variable 'x'.

Reorder the terms:
-240 + 4x + 3x2 = 240 + -240

Combine like terms: 240 + -240 = 0
-240 + 4x + 3x2 = 0

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

Divide each side by '3'.
-80 + 1.333333333x + x2 = 0

Move the constant term to the right:

Add '80' to each side of the equation.
-80 + 1.333333333x + 80 + x2 = 0 + 80

Reorder the terms:
-80 + 80 + 1.333333333x + x2 = 0 + 80

Combine like terms: -80 + 80 = 0
0 + 1.333333333x + x2 = 0 + 80
1.333333333x + x2 = 0 + 80

Combine like terms: 0 + 80 = 80
1.333333333x + x2 = 80

The x term is 1.333333333x.  Take half its coefficient (0.6666666665).
Square it (0.4444444442) and add it to both sides.

Add '0.4444444442' to each side of the equation.
1.333333333x + 0.4444444442 + x2 = 80 + 0.4444444442

Reorder the terms:
0.4444444442 + 1.333333333x + x2 = 80 + 0.4444444442

Combine like terms: 80 + 0.4444444442 = 80.4444444442
0.4444444442 + 1.333333333x + x2 = 80.4444444442

Factor a perfect square on the left side:
(x + 0.6666666665)(x + 0.6666666665) = 80.4444444442

Calculate the square root of the right side: 8.969082698

Break this problem into two subproblems by setting 
(x + 0.6666666665) equal to 8.969082698 and -8.969082698.

Subproblem 1

x + 0.6666666665 = 8.969082698 Simplifying x + 0.6666666665 = 8.969082698 Reorder the terms: 0.6666666665 + x = 8.969082698 Solving 0.6666666665 + x = 8.969082698 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.6666666665' to each side of the equation. 0.6666666665 + -0.6666666665 + x = 8.969082698 + -0.6666666665 Combine like terms: 0.6666666665 + -0.6666666665 = 0.0000000000 0.0000000000 + x = 8.969082698 + -0.6666666665 x = 8.969082698 + -0.6666666665 Combine like terms: 8.969082698 + -0.6666666665 = 8.3024160315 x = 8.3024160315 Simplifying x = 8.3024160315

Subproblem 2

x + 0.6666666665 = -8.969082698 Simplifying x + 0.6666666665 = -8.969082698 Reorder the terms: 0.6666666665 + x = -8.969082698 Solving 0.6666666665 + x = -8.969082698 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.6666666665' to each side of the equation. 0.6666666665 + -0.6666666665 + x = -8.969082698 + -0.6666666665 Combine like terms: 0.6666666665 + -0.6666666665 = 0.0000000000 0.0000000000 + x = -8.969082698 + -0.6666666665 x = -8.969082698 + -0.6666666665 Combine like terms: -8.969082698 + -0.6666666665 = -9.6357493645 x = -9.6357493645 Simplifying x = -9.6357493645

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.3024160315, -9.6357493645}

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