3x^2-19=-3x

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Solution for 3x^2-19=-3x equation:


Simplifying
3x2 + -19 = -3x

Reorder the terms:
-19 + 3x2 = -3x

Solving
-19 + 3x2 = -3x

Solving for variable 'x'.

Reorder the terms:
-19 + 3x + 3x2 = -3x + 3x

Combine like terms: -3x + 3x = 0
-19 + 3x + 3x2 = 0

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

Divide each side by '3'.
-6.333333333 + x + x2 = 0

Move the constant term to the right:

Add '6.333333333' to each side of the equation.
-6.333333333 + x + 6.333333333 + x2 = 0 + 6.333333333

Reorder the terms:
-6.333333333 + 6.333333333 + x + x2 = 0 + 6.333333333

Combine like terms: -6.333333333 + 6.333333333 = 0.000000000
0.000000000 + x + x2 = 0 + 6.333333333
x + x2 = 0 + 6.333333333

Combine like terms: 0 + 6.333333333 = 6.333333333
x + x2 = 6.333333333

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + x2 = 6.333333333 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 6.333333333 + 0.25

Combine like terms: 6.333333333 + 0.25 = 6.583333333
1.25 + x2 = 6.583333333

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 6.583333333

Calculate the square root of the right side: 2.56580072

Break this problem into two subproblems by setting 
(x + 0.5) equal to 2.56580072 and -2.56580072.

Subproblem 1

x + 0.5 = 2.56580072 Simplifying x + 0.5 = 2.56580072 Reorder the terms: 0.5 + x = 2.56580072 Solving 0.5 + x = 2.56580072 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 2.56580072 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 2.56580072 + -0.5 x = 2.56580072 + -0.5 Combine like terms: 2.56580072 + -0.5 = 2.06580072 x = 2.06580072 Simplifying x = 2.06580072

Subproblem 2

x + 0.5 = -2.56580072 Simplifying x + 0.5 = -2.56580072 Reorder the terms: 0.5 + x = -2.56580072 Solving 0.5 + x = -2.56580072 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -2.56580072 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -2.56580072 + -0.5 x = -2.56580072 + -0.5 Combine like terms: -2.56580072 + -0.5 = -3.06580072 x = -3.06580072 Simplifying x = -3.06580072

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.06580072, -3.06580072}

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