19x+6x^2+18=13

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Solution for 19x+6x^2+18=13 equation:


Simplifying
19x + 6x2 + 18 = 13

Reorder the terms:
18 + 19x + 6x2 = 13

Solving
18 + 19x + 6x2 = 13

Solving for variable 'x'.

Reorder the terms:
18 + -13 + 19x + 6x2 = 13 + -13

Combine like terms: 18 + -13 = 5
5 + 19x + 6x2 = 13 + -13

Combine like terms: 13 + -13 = 0
5 + 19x + 6x2 = 0

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

Divide each side by '6'.
0.8333333333 + 3.166666667x + x2 = 0

Move the constant term to the right:

Add '-0.8333333333' to each side of the equation.
0.8333333333 + 3.166666667x + -0.8333333333 + x2 = 0 + -0.8333333333

Reorder the terms:
0.8333333333 + -0.8333333333 + 3.166666667x + x2 = 0 + -0.8333333333

Combine like terms: 0.8333333333 + -0.8333333333 = 0.0000000000
0.0000000000 + 3.166666667x + x2 = 0 + -0.8333333333
3.166666667x + x2 = 0 + -0.8333333333

Combine like terms: 0 + -0.8333333333 = -0.8333333333
3.166666667x + x2 = -0.8333333333

The x term is 3.166666667x.  Take half its coefficient (1.583333334).
Square it (2.506944447) and add it to both sides.

Add '2.506944447' to each side of the equation.
3.166666667x + 2.506944447 + x2 = -0.8333333333 + 2.506944447

Reorder the terms:
2.506944447 + 3.166666667x + x2 = -0.8333333333 + 2.506944447

Combine like terms: -0.8333333333 + 2.506944447 = 1.6736111137
2.506944447 + 3.166666667x + x2 = 1.6736111137

Factor a perfect square on the left side:
(x + 1.583333334)(x + 1.583333334) = 1.6736111137

Calculate the square root of the right side: 1.293681226

Break this problem into two subproblems by setting 
(x + 1.583333334) equal to 1.293681226 and -1.293681226.

Subproblem 1

x + 1.583333334 = 1.293681226 Simplifying x + 1.583333334 = 1.293681226 Reorder the terms: 1.583333334 + x = 1.293681226 Solving 1.583333334 + x = 1.293681226 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.583333334' to each side of the equation. 1.583333334 + -1.583333334 + x = 1.293681226 + -1.583333334 Combine like terms: 1.583333334 + -1.583333334 = 0.000000000 0.000000000 + x = 1.293681226 + -1.583333334 x = 1.293681226 + -1.583333334 Combine like terms: 1.293681226 + -1.583333334 = -0.289652108 x = -0.289652108 Simplifying x = -0.289652108

Subproblem 2

x + 1.583333334 = -1.293681226 Simplifying x + 1.583333334 = -1.293681226 Reorder the terms: 1.583333334 + x = -1.293681226 Solving 1.583333334 + x = -1.293681226 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.583333334' to each side of the equation. 1.583333334 + -1.583333334 + x = -1.293681226 + -1.583333334 Combine like terms: 1.583333334 + -1.583333334 = 0.000000000 0.000000000 + x = -1.293681226 + -1.583333334 x = -1.293681226 + -1.583333334 Combine like terms: -1.293681226 + -1.583333334 = -2.87701456 x = -2.87701456 Simplifying x = -2.87701456

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.289652108, -2.87701456}

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