x^2+19=-9x

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


Simplifying
x2 + 19 = -9x

Reorder the terms:
19 + x2 = -9x

Solving
19 + x2 = -9x

Solving for variable 'x'.

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

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

Begin completing the square.

Move the constant term to the right:

Add '-19' to each side of the equation.
19 + 9x + -19 + x2 = 0 + -19

Reorder the terms:
19 + -19 + 9x + x2 = 0 + -19

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

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

The x term is 9x.  Take half its coefficient (4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
9x + 20.25 + x2 = -19 + 20.25

Reorder the terms:
20.25 + 9x + x2 = -19 + 20.25

Combine like terms: -19 + 20.25 = 1.25
20.25 + 9x + x2 = 1.25

Factor a perfect square on the left side:
(x + 4.5)(x + 4.5) = 1.25

Calculate the square root of the right side: 1.118033989

Break this problem into two subproblems by setting 
(x + 4.5) equal to 1.118033989 and -1.118033989.

Subproblem 1

x + 4.5 = 1.118033989 Simplifying x + 4.5 = 1.118033989 Reorder the terms: 4.5 + x = 1.118033989 Solving 4.5 + x = 1.118033989 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = 1.118033989 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = 1.118033989 + -4.5 x = 1.118033989 + -4.5 Combine like terms: 1.118033989 + -4.5 = -3.381966011 x = -3.381966011 Simplifying x = -3.381966011

Subproblem 2

x + 4.5 = -1.118033989 Simplifying x + 4.5 = -1.118033989 Reorder the terms: 4.5 + x = -1.118033989 Solving 4.5 + x = -1.118033989 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = -1.118033989 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = -1.118033989 + -4.5 x = -1.118033989 + -4.5 Combine like terms: -1.118033989 + -4.5 = -5.618033989 x = -5.618033989 Simplifying x = -5.618033989

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-3.381966011, -5.618033989}

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