(3x^2+5x+2)+(8x^2-6)=

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Solution for (3x^2+5x+2)+(8x^2-6)= equation:


Simplifying
(3x2 + 5x + 2) + (8x2 + -6) = 0

Reorder the terms:
(2 + 5x + 3x2) + (8x2 + -6) = 0

Remove parenthesis around (2 + 5x + 3x2)
2 + 5x + 3x2 + (8x2 + -6) = 0

Reorder the terms:
2 + 5x + 3x2 + (-6 + 8x2) = 0

Remove parenthesis around (-6 + 8x2)
2 + 5x + 3x2 + -6 + 8x2 = 0

Reorder the terms:
2 + -6 + 5x + 3x2 + 8x2 = 0

Combine like terms: 2 + -6 = -4
-4 + 5x + 3x2 + 8x2 = 0

Combine like terms: 3x2 + 8x2 = 11x2
-4 + 5x + 11x2 = 0

Solving
-4 + 5x + 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'.
-0.3636363636 + 0.4545454545x + x2 = 0

Move the constant term to the right:

Add '0.3636363636' to each side of the equation.
-0.3636363636 + 0.4545454545x + 0.3636363636 + x2 = 0 + 0.3636363636

Reorder the terms:
-0.3636363636 + 0.3636363636 + 0.4545454545x + x2 = 0 + 0.3636363636

Combine like terms: -0.3636363636 + 0.3636363636 = 0.0000000000
0.0000000000 + 0.4545454545x + x2 = 0 + 0.3636363636
0.4545454545x + x2 = 0 + 0.3636363636

Combine like terms: 0 + 0.3636363636 = 0.3636363636
0.4545454545x + x2 = 0.3636363636

The x term is 0.4545454545x.  Take half its coefficient (0.2272727273).
Square it (0.05165289257) and add it to both sides.

Add '0.05165289257' to each side of the equation.
0.4545454545x + 0.05165289257 + x2 = 0.3636363636 + 0.05165289257

Reorder the terms:
0.05165289257 + 0.4545454545x + x2 = 0.3636363636 + 0.05165289257

Combine like terms: 0.3636363636 + 0.05165289257 = 0.41528925617
0.05165289257 + 0.4545454545x + x2 = 0.41528925617

Factor a perfect square on the left side:
(x + 0.2272727273)(x + 0.2272727273) = 0.41528925617

Calculate the square root of the right side: 0.644429404

Break this problem into two subproblems by setting 
(x + 0.2272727273) equal to 0.644429404 and -0.644429404.

Subproblem 1

x + 0.2272727273 = 0.644429404 Simplifying x + 0.2272727273 = 0.644429404 Reorder the terms: 0.2272727273 + x = 0.644429404 Solving 0.2272727273 + x = 0.644429404 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2272727273' to each side of the equation. 0.2272727273 + -0.2272727273 + x = 0.644429404 + -0.2272727273 Combine like terms: 0.2272727273 + -0.2272727273 = 0.0000000000 0.0000000000 + x = 0.644429404 + -0.2272727273 x = 0.644429404 + -0.2272727273 Combine like terms: 0.644429404 + -0.2272727273 = 0.4171566767 x = 0.4171566767 Simplifying x = 0.4171566767

Subproblem 2

x + 0.2272727273 = -0.644429404 Simplifying x + 0.2272727273 = -0.644429404 Reorder the terms: 0.2272727273 + x = -0.644429404 Solving 0.2272727273 + x = -0.644429404 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2272727273' to each side of the equation. 0.2272727273 + -0.2272727273 + x = -0.644429404 + -0.2272727273 Combine like terms: 0.2272727273 + -0.2272727273 = 0.0000000000 0.0000000000 + x = -0.644429404 + -0.2272727273 x = -0.644429404 + -0.2272727273 Combine like terms: -0.644429404 + -0.2272727273 = -0.8717021313 x = -0.8717021313 Simplifying x = -0.8717021313

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.4171566767, -0.8717021313}

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