3x^2+19x=360

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Solution for 3x^2+19x=360 equation:


Simplifying
3x2 + 19x = 360

Reorder the terms:
19x + 3x2 = 360

Solving
19x + 3x2 = 360

Solving for variable 'x'.

Reorder the terms:
-360 + 19x + 3x2 = 360 + -360

Combine like terms: 360 + -360 = 0
-360 + 19x + 3x2 = 0

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

Divide each side by '3'.
-120 + 6.333333333x + x2 = 0

Move the constant term to the right:

Add '120' to each side of the equation.
-120 + 6.333333333x + 120 + x2 = 0 + 120

Reorder the terms:
-120 + 120 + 6.333333333x + x2 = 0 + 120

Combine like terms: -120 + 120 = 0
0 + 6.333333333x + x2 = 0 + 120
6.333333333x + x2 = 0 + 120

Combine like terms: 0 + 120 = 120
6.333333333x + x2 = 120

The x term is 6.333333333x.  Take half its coefficient (3.166666667).
Square it (10.02777778) and add it to both sides.

Add '10.02777778' to each side of the equation.
6.333333333x + 10.02777778 + x2 = 120 + 10.02777778

Reorder the terms:
10.02777778 + 6.333333333x + x2 = 120 + 10.02777778

Combine like terms: 120 + 10.02777778 = 130.02777778
10.02777778 + 6.333333333x + x2 = 130.02777778

Factor a perfect square on the left side:
(x + 3.166666667)(x + 3.166666667) = 130.02777778

Calculate the square root of the right side: 11.402972322

Break this problem into two subproblems by setting 
(x + 3.166666667) equal to 11.402972322 and -11.402972322.

Subproblem 1

x + 3.166666667 = 11.402972322 Simplifying x + 3.166666667 = 11.402972322 Reorder the terms: 3.166666667 + x = 11.402972322 Solving 3.166666667 + x = 11.402972322 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.166666667' to each side of the equation. 3.166666667 + -3.166666667 + x = 11.402972322 + -3.166666667 Combine like terms: 3.166666667 + -3.166666667 = 0.000000000 0.000000000 + x = 11.402972322 + -3.166666667 x = 11.402972322 + -3.166666667 Combine like terms: 11.402972322 + -3.166666667 = 8.236305655 x = 8.236305655 Simplifying x = 8.236305655

Subproblem 2

x + 3.166666667 = -11.402972322 Simplifying x + 3.166666667 = -11.402972322 Reorder the terms: 3.166666667 + x = -11.402972322 Solving 3.166666667 + x = -11.402972322 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.166666667' to each side of the equation. 3.166666667 + -3.166666667 + x = -11.402972322 + -3.166666667 Combine like terms: 3.166666667 + -3.166666667 = 0.000000000 0.000000000 + x = -11.402972322 + -3.166666667 x = -11.402972322 + -3.166666667 Combine like terms: -11.402972322 + -3.166666667 = -14.569638989 x = -14.569638989 Simplifying x = -14.569638989

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.236305655, -14.569638989}

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