3x^2+4x+4=64

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Solution for 3x^2+4x+4=64 equation:


Simplifying
3x2 + 4x + 4 = 64

Reorder the terms:
4 + 4x + 3x2 = 64

Solving
4 + 4x + 3x2 = 64

Solving for variable 'x'.

Reorder the terms:
4 + -64 + 4x + 3x2 = 64 + -64

Combine like terms: 4 + -64 = -60
-60 + 4x + 3x2 = 64 + -64

Combine like terms: 64 + -64 = 0
-60 + 4x + 3x2 = 0

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

Divide each side by '3'.
-20 + 1.333333333x + x2 = 0

Move the constant term to the right:

Add '20' to each side of the equation.
-20 + 1.333333333x + 20 + x2 = 0 + 20

Reorder the terms:
-20 + 20 + 1.333333333x + x2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + 1.333333333x + x2 = 0 + 20
1.333333333x + x2 = 0 + 20

Combine like terms: 0 + 20 = 20
1.333333333x + x2 = 20

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 = 20 + 0.4444444442

Reorder the terms:
0.4444444442 + 1.333333333x + x2 = 20 + 0.4444444442

Combine like terms: 20 + 0.4444444442 = 20.4444444442
0.4444444442 + 1.333333333x + x2 = 20.4444444442

Factor a perfect square on the left side:
(x + 0.6666666665)(x + 0.6666666665) = 20.4444444442

Calculate the square root of the right side: 4.521553322

Break this problem into two subproblems by setting 
(x + 0.6666666665) equal to 4.521553322 and -4.521553322.

Subproblem 1

x + 0.6666666665 = 4.521553322 Simplifying x + 0.6666666665 = 4.521553322 Reorder the terms: 0.6666666665 + x = 4.521553322 Solving 0.6666666665 + x = 4.521553322 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 = 4.521553322 + -0.6666666665 Combine like terms: 0.6666666665 + -0.6666666665 = 0.0000000000 0.0000000000 + x = 4.521553322 + -0.6666666665 x = 4.521553322 + -0.6666666665 Combine like terms: 4.521553322 + -0.6666666665 = 3.8548866555 x = 3.8548866555 Simplifying x = 3.8548866555

Subproblem 2

x + 0.6666666665 = -4.521553322 Simplifying x + 0.6666666665 = -4.521553322 Reorder the terms: 0.6666666665 + x = -4.521553322 Solving 0.6666666665 + x = -4.521553322 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 = -4.521553322 + -0.6666666665 Combine like terms: 0.6666666665 + -0.6666666665 = 0.0000000000 0.0000000000 + x = -4.521553322 + -0.6666666665 x = -4.521553322 + -0.6666666665 Combine like terms: -4.521553322 + -0.6666666665 = -5.1882199885 x = -5.1882199885 Simplifying x = -5.1882199885

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.8548866555, -5.1882199885}

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