3x^2+4x=99

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Solution for 3x^2+4x=99 equation:


Simplifying
3x2 + 4x = 99

Reorder the terms:
4x + 3x2 = 99

Solving
4x + 3x2 = 99

Solving for variable 'x'.

Reorder the terms:
-99 + 4x + 3x2 = 99 + -99

Combine like terms: 99 + -99 = 0
-99 + 4x + 3x2 = 0

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

Divide each side by '3'.
-33 + 1.333333333x + x2 = 0

Move the constant term to the right:

Add '33' to each side of the equation.
-33 + 1.333333333x + 33 + x2 = 0 + 33

Reorder the terms:
-33 + 33 + 1.333333333x + x2 = 0 + 33

Combine like terms: -33 + 33 = 0
0 + 1.333333333x + x2 = 0 + 33
1.333333333x + x2 = 0 + 33

Combine like terms: 0 + 33 = 33
1.333333333x + x2 = 33

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 = 33 + 0.4444444442

Reorder the terms:
0.4444444442 + 1.333333333x + x2 = 33 + 0.4444444442

Combine like terms: 33 + 0.4444444442 = 33.4444444442
0.4444444442 + 1.333333333x + x2 = 33.4444444442

Factor a perfect square on the left side:
(x + 0.6666666665)(x + 0.6666666665) = 33.4444444442

Calculate the square root of the right side: 5.783117191

Break this problem into two subproblems by setting 
(x + 0.6666666665) equal to 5.783117191 and -5.783117191.

Subproblem 1

x + 0.6666666665 = 5.783117191 Simplifying x + 0.6666666665 = 5.783117191 Reorder the terms: 0.6666666665 + x = 5.783117191 Solving 0.6666666665 + x = 5.783117191 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 = 5.783117191 + -0.6666666665 Combine like terms: 0.6666666665 + -0.6666666665 = 0.0000000000 0.0000000000 + x = 5.783117191 + -0.6666666665 x = 5.783117191 + -0.6666666665 Combine like terms: 5.783117191 + -0.6666666665 = 5.1164505245 x = 5.1164505245 Simplifying x = 5.1164505245

Subproblem 2

x + 0.6666666665 = -5.783117191 Simplifying x + 0.6666666665 = -5.783117191 Reorder the terms: 0.6666666665 + x = -5.783117191 Solving 0.6666666665 + x = -5.783117191 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 = -5.783117191 + -0.6666666665 Combine like terms: 0.6666666665 + -0.6666666665 = 0.0000000000 0.0000000000 + x = -5.783117191 + -0.6666666665 x = -5.783117191 + -0.6666666665 Combine like terms: -5.783117191 + -0.6666666665 = -6.4497838575 x = -6.4497838575 Simplifying x = -6.4497838575

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.1164505245, -6.4497838575}

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