3x+8x-19=x^2+1

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Solution for 3x+8x-19=x^2+1 equation:


Simplifying
3x + 8x + -19 = x2 + 1

Reorder the terms:
-19 + 3x + 8x = x2 + 1

Combine like terms: 3x + 8x = 11x
-19 + 11x = x2 + 1

Reorder the terms:
-19 + 11x = 1 + x2

Solving
-19 + 11x = 1 + x2

Solving for variable 'x'.

Reorder the terms:
-19 + -1 + 11x + -1x2 = 1 + x2 + -1 + -1x2

Combine like terms: -19 + -1 = -20
-20 + 11x + -1x2 = 1 + x2 + -1 + -1x2

Reorder the terms:
-20 + 11x + -1x2 = 1 + -1 + x2 + -1x2

Combine like terms: 1 + -1 = 0
-20 + 11x + -1x2 = 0 + x2 + -1x2
-20 + 11x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-20 + 11x + -1x2 = 0

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

Divide each side by '-1'.
20 + -11x + x2 = 0

Move the constant term to the right:

Add '-20' to each side of the equation.
20 + -11x + -20 + x2 = 0 + -20

Reorder the terms:
20 + -20 + -11x + x2 = 0 + -20

Combine like terms: 20 + -20 = 0
0 + -11x + x2 = 0 + -20
-11x + x2 = 0 + -20

Combine like terms: 0 + -20 = -20
-11x + x2 = -20

The x term is -11x.  Take half its coefficient (-5.5).
Square it (30.25) and add it to both sides.

Add '30.25' to each side of the equation.
-11x + 30.25 + x2 = -20 + 30.25

Reorder the terms:
30.25 + -11x + x2 = -20 + 30.25

Combine like terms: -20 + 30.25 = 10.25
30.25 + -11x + x2 = 10.25

Factor a perfect square on the left side:
(x + -5.5)(x + -5.5) = 10.25

Calculate the square root of the right side: 3.201562119

Break this problem into two subproblems by setting 
(x + -5.5) equal to 3.201562119 and -3.201562119.

Subproblem 1

x + -5.5 = 3.201562119 Simplifying x + -5.5 = 3.201562119 Reorder the terms: -5.5 + x = 3.201562119 Solving -5.5 + x = 3.201562119 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.5' to each side of the equation. -5.5 + 5.5 + x = 3.201562119 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + x = 3.201562119 + 5.5 x = 3.201562119 + 5.5 Combine like terms: 3.201562119 + 5.5 = 8.701562119 x = 8.701562119 Simplifying x = 8.701562119

Subproblem 2

x + -5.5 = -3.201562119 Simplifying x + -5.5 = -3.201562119 Reorder the terms: -5.5 + x = -3.201562119 Solving -5.5 + x = -3.201562119 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.5' to each side of the equation. -5.5 + 5.5 + x = -3.201562119 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + x = -3.201562119 + 5.5 x = -3.201562119 + 5.5 Combine like terms: -3.201562119 + 5.5 = 2.298437881 x = 2.298437881 Simplifying x = 2.298437881

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.701562119, 2.298437881}

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