19x+361=x^2+9x+9x+81

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Solution for 19x+361=x^2+9x+9x+81 equation:


Simplifying
19x + 361 = x2 + 9x + 9x + 81

Reorder the terms:
361 + 19x = x2 + 9x + 9x + 81

Reorder the terms:
361 + 19x = 81 + 9x + 9x + x2

Combine like terms: 9x + 9x = 18x
361 + 19x = 81 + 18x + x2

Solving
361 + 19x = 81 + 18x + x2

Solving for variable 'x'.

Reorder the terms:
361 + -81 + 19x + -18x + -1x2 = 81 + 18x + x2 + -81 + -18x + -1x2

Combine like terms: 361 + -81 = 280
280 + 19x + -18x + -1x2 = 81 + 18x + x2 + -81 + -18x + -1x2

Combine like terms: 19x + -18x = 1x
280 + 1x + -1x2 = 81 + 18x + x2 + -81 + -18x + -1x2

Reorder the terms:
280 + 1x + -1x2 = 81 + -81 + 18x + -18x + x2 + -1x2

Combine like terms: 81 + -81 = 0
280 + 1x + -1x2 = 0 + 18x + -18x + x2 + -1x2
280 + 1x + -1x2 = 18x + -18x + x2 + -1x2

Combine like terms: 18x + -18x = 0
280 + 1x + -1x2 = 0 + x2 + -1x2
280 + 1x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
280 + 1x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-280 + -1x + x2 = 0

Move the constant term to the right:

Add '280' to each side of the equation.
-280 + -1x + 280 + x2 = 0 + 280

Reorder the terms:
-280 + 280 + -1x + x2 = 0 + 280

Combine like terms: -280 + 280 = 0
0 + -1x + x2 = 0 + 280
-1x + x2 = 0 + 280

Combine like terms: 0 + 280 = 280
-1x + x2 = 280

The x term is -1x.  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.
-1x + 0.25 + x2 = 280 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 280 + 0.25

Combine like terms: 280 + 0.25 = 280.25
0.25 + -1x + x2 = 280.25

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 280.25

Calculate the square root of the right side: 16.740669043

Break this problem into two subproblems by setting 
(x + -0.5) equal to 16.740669043 and -16.740669043.

Subproblem 1

x + -0.5 = 16.740669043 Simplifying x + -0.5 = 16.740669043 Reorder the terms: -0.5 + x = 16.740669043 Solving -0.5 + x = 16.740669043 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 = 16.740669043 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 16.740669043 + 0.5 x = 16.740669043 + 0.5 Combine like terms: 16.740669043 + 0.5 = 17.240669043 x = 17.240669043 Simplifying x = 17.240669043

Subproblem 2

x + -0.5 = -16.740669043 Simplifying x + -0.5 = -16.740669043 Reorder the terms: -0.5 + x = -16.740669043 Solving -0.5 + x = -16.740669043 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 = -16.740669043 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -16.740669043 + 0.5 x = -16.740669043 + 0.5 Combine like terms: -16.740669043 + 0.5 = -16.240669043 x = -16.240669043 Simplifying x = -16.240669043

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.240669043, -16.240669043}

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