9x^2+3x=19

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Solution for 9x^2+3x=19 equation:


Simplifying
9x2 + 3x = 19

Reorder the terms:
3x + 9x2 = 19

Solving
3x + 9x2 = 19

Solving for variable 'x'.

Reorder the terms:
-19 + 3x + 9x2 = 19 + -19

Combine like terms: 19 + -19 = 0
-19 + 3x + 9x2 = 0

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

Divide each side by '9'.
-2.111111111 + 0.3333333333x + x2 = 0

Move the constant term to the right:

Add '2.111111111' to each side of the equation.
-2.111111111 + 0.3333333333x + 2.111111111 + x2 = 0 + 2.111111111

Reorder the terms:
-2.111111111 + 2.111111111 + 0.3333333333x + x2 = 0 + 2.111111111

Combine like terms: -2.111111111 + 2.111111111 = 0.000000000
0.000000000 + 0.3333333333x + x2 = 0 + 2.111111111
0.3333333333x + x2 = 0 + 2.111111111

Combine like terms: 0 + 2.111111111 = 2.111111111
0.3333333333x + x2 = 2.111111111

The x term is 0.3333333333x.  Take half its coefficient (0.1666666667).
Square it (0.02777777779) and add it to both sides.

Add '0.02777777779' to each side of the equation.
0.3333333333x + 0.02777777779 + x2 = 2.111111111 + 0.02777777779

Reorder the terms:
0.02777777779 + 0.3333333333x + x2 = 2.111111111 + 0.02777777779

Combine like terms: 2.111111111 + 0.02777777779 = 2.13888888879
0.02777777779 + 0.3333333333x + x2 = 2.13888888879

Factor a perfect square on the left side:
(x + 0.1666666667)(x + 0.1666666667) = 2.13888888879

Calculate the square root of the right side: 1.462494065

Break this problem into two subproblems by setting 
(x + 0.1666666667) equal to 1.462494065 and -1.462494065.

Subproblem 1

x + 0.1666666667 = 1.462494065 Simplifying x + 0.1666666667 = 1.462494065 Reorder the terms: 0.1666666667 + x = 1.462494065 Solving 0.1666666667 + x = 1.462494065 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1666666667' to each side of the equation. 0.1666666667 + -0.1666666667 + x = 1.462494065 + -0.1666666667 Combine like terms: 0.1666666667 + -0.1666666667 = 0.0000000000 0.0000000000 + x = 1.462494065 + -0.1666666667 x = 1.462494065 + -0.1666666667 Combine like terms: 1.462494065 + -0.1666666667 = 1.2958273983 x = 1.2958273983 Simplifying x = 1.2958273983

Subproblem 2

x + 0.1666666667 = -1.462494065 Simplifying x + 0.1666666667 = -1.462494065 Reorder the terms: 0.1666666667 + x = -1.462494065 Solving 0.1666666667 + x = -1.462494065 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1666666667' to each side of the equation. 0.1666666667 + -0.1666666667 + x = -1.462494065 + -0.1666666667 Combine like terms: 0.1666666667 + -0.1666666667 = 0.0000000000 0.0000000000 + x = -1.462494065 + -0.1666666667 x = -1.462494065 + -0.1666666667 Combine like terms: -1.462494065 + -0.1666666667 = -1.6291607317 x = -1.6291607317 Simplifying x = -1.6291607317

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.2958273983, -1.6291607317}

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