6(3x^2+5x-2)+3x^2-4=0

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Solution for 6(3x^2+5x-2)+3x^2-4=0 equation:


Simplifying
6(3x2 + 5x + -2) + 3x2 + -4 = 0

Reorder the terms:
6(-2 + 5x + 3x2) + 3x2 + -4 = 0
(-2 * 6 + 5x * 6 + 3x2 * 6) + 3x2 + -4 = 0
(-12 + 30x + 18x2) + 3x2 + -4 = 0

Reorder the terms:
-12 + -4 + 30x + 18x2 + 3x2 = 0

Combine like terms: -12 + -4 = -16
-16 + 30x + 18x2 + 3x2 = 0

Combine like terms: 18x2 + 3x2 = 21x2
-16 + 30x + 21x2 = 0

Solving
-16 + 30x + 21x2 = 0

Solving for variable 'x'.

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

Divide each side by '21'.
-0.7619047619 + 1.428571429x + x2 = 0

Move the constant term to the right:

Add '0.7619047619' to each side of the equation.
-0.7619047619 + 1.428571429x + 0.7619047619 + x2 = 0 + 0.7619047619

Reorder the terms:
-0.7619047619 + 0.7619047619 + 1.428571429x + x2 = 0 + 0.7619047619

Combine like terms: -0.7619047619 + 0.7619047619 = 0.0000000000
0.0000000000 + 1.428571429x + x2 = 0 + 0.7619047619
1.428571429x + x2 = 0 + 0.7619047619

Combine like terms: 0 + 0.7619047619 = 0.7619047619
1.428571429x + x2 = 0.7619047619

The x term is 1.428571429x.  Take half its coefficient (0.7142857145).
Square it (0.5102040819) and add it to both sides.

Add '0.5102040819' to each side of the equation.
1.428571429x + 0.5102040819 + x2 = 0.7619047619 + 0.5102040819

Reorder the terms:
0.5102040819 + 1.428571429x + x2 = 0.7619047619 + 0.5102040819

Combine like terms: 0.7619047619 + 0.5102040819 = 1.2721088438
0.5102040819 + 1.428571429x + x2 = 1.2721088438

Factor a perfect square on the left side:
(x + 0.7142857145)(x + 0.7142857145) = 1.2721088438

Calculate the square root of the right side: 1.127878027

Break this problem into two subproblems by setting 
(x + 0.7142857145) equal to 1.127878027 and -1.127878027.

Subproblem 1

x + 0.7142857145 = 1.127878027 Simplifying x + 0.7142857145 = 1.127878027 Reorder the terms: 0.7142857145 + x = 1.127878027 Solving 0.7142857145 + x = 1.127878027 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.7142857145' to each side of the equation. 0.7142857145 + -0.7142857145 + x = 1.127878027 + -0.7142857145 Combine like terms: 0.7142857145 + -0.7142857145 = 0.0000000000 0.0000000000 + x = 1.127878027 + -0.7142857145 x = 1.127878027 + -0.7142857145 Combine like terms: 1.127878027 + -0.7142857145 = 0.4135923125 x = 0.4135923125 Simplifying x = 0.4135923125

Subproblem 2

x + 0.7142857145 = -1.127878027 Simplifying x + 0.7142857145 = -1.127878027 Reorder the terms: 0.7142857145 + x = -1.127878027 Solving 0.7142857145 + x = -1.127878027 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.7142857145' to each side of the equation. 0.7142857145 + -0.7142857145 + x = -1.127878027 + -0.7142857145 Combine like terms: 0.7142857145 + -0.7142857145 = 0.0000000000 0.0000000000 + x = -1.127878027 + -0.7142857145 x = -1.127878027 + -0.7142857145 Combine like terms: -1.127878027 + -0.7142857145 = -1.8421637415 x = -1.8421637415 Simplifying x = -1.8421637415

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.4135923125, -1.8421637415}

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