(3x^2-6x+23)+(8x^2+8x-88)=

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Solution for (3x^2-6x+23)+(8x^2+8x-88)= equation:


Simplifying
(3x2 + -6x + 23) + (8x2 + 8x + -88) = 0

Reorder the terms:
(23 + -6x + 3x2) + (8x2 + 8x + -88) = 0

Remove parenthesis around (23 + -6x + 3x2)
23 + -6x + 3x2 + (8x2 + 8x + -88) = 0

Reorder the terms:
23 + -6x + 3x2 + (-88 + 8x + 8x2) = 0

Remove parenthesis around (-88 + 8x + 8x2)
23 + -6x + 3x2 + -88 + 8x + 8x2 = 0

Reorder the terms:
23 + -88 + -6x + 8x + 3x2 + 8x2 = 0

Combine like terms: 23 + -88 = -65
-65 + -6x + 8x + 3x2 + 8x2 = 0

Combine like terms: -6x + 8x = 2x
-65 + 2x + 3x2 + 8x2 = 0

Combine like terms: 3x2 + 8x2 = 11x2
-65 + 2x + 11x2 = 0

Solving
-65 + 2x + 11x2 = 0

Solving for variable 'x'.

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

Divide each side by '11'.
-5.909090909 + 0.1818181818x + x2 = 0

Move the constant term to the right:

Add '5.909090909' to each side of the equation.
-5.909090909 + 0.1818181818x + 5.909090909 + x2 = 0 + 5.909090909

Reorder the terms:
-5.909090909 + 5.909090909 + 0.1818181818x + x2 = 0 + 5.909090909

Combine like terms: -5.909090909 + 5.909090909 = 0.000000000
0.000000000 + 0.1818181818x + x2 = 0 + 5.909090909
0.1818181818x + x2 = 0 + 5.909090909

Combine like terms: 0 + 5.909090909 = 5.909090909
0.1818181818x + x2 = 5.909090909

The x term is 0.1818181818x.  Take half its coefficient (0.0909090909).
Square it (0.008264462808) and add it to both sides.

Add '0.008264462808' to each side of the equation.
0.1818181818x + 0.008264462808 + x2 = 5.909090909 + 0.008264462808

Reorder the terms:
0.008264462808 + 0.1818181818x + x2 = 5.909090909 + 0.008264462808

Combine like terms: 5.909090909 + 0.008264462808 = 5.917355371808
0.008264462808 + 0.1818181818x + x2 = 5.917355371808

Factor a perfect square on the left side:
(x + 0.0909090909)(x + 0.0909090909) = 5.917355371808

Calculate the square root of the right side: 2.432561484

Break this problem into two subproblems by setting 
(x + 0.0909090909) equal to 2.432561484 and -2.432561484.

Subproblem 1

x + 0.0909090909 = 2.432561484 Simplifying x + 0.0909090909 = 2.432561484 Reorder the terms: 0.0909090909 + x = 2.432561484 Solving 0.0909090909 + x = 2.432561484 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.0909090909' to each side of the equation. 0.0909090909 + -0.0909090909 + x = 2.432561484 + -0.0909090909 Combine like terms: 0.0909090909 + -0.0909090909 = 0.0000000000 0.0000000000 + x = 2.432561484 + -0.0909090909 x = 2.432561484 + -0.0909090909 Combine like terms: 2.432561484 + -0.0909090909 = 2.3416523931 x = 2.3416523931 Simplifying x = 2.3416523931

Subproblem 2

x + 0.0909090909 = -2.432561484 Simplifying x + 0.0909090909 = -2.432561484 Reorder the terms: 0.0909090909 + x = -2.432561484 Solving 0.0909090909 + x = -2.432561484 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.0909090909' to each side of the equation. 0.0909090909 + -0.0909090909 + x = -2.432561484 + -0.0909090909 Combine like terms: 0.0909090909 + -0.0909090909 = 0.0000000000 0.0000000000 + x = -2.432561484 + -0.0909090909 x = -2.432561484 + -0.0909090909 Combine like terms: -2.432561484 + -0.0909090909 = -2.5234705749 x = -2.5234705749 Simplifying x = -2.5234705749

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.3416523931, -2.5234705749}

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