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

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Solution for (2x^2+6x-8)+(2x^2-3x+5)=0 equation:


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

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

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

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

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

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

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

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

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

Solving
-3 + 3x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-0.75 + 0.75x + x2 = 0

Move the constant term to the right:

Add '0.75' to each side of the equation.
-0.75 + 0.75x + 0.75 + x2 = 0 + 0.75

Reorder the terms:
-0.75 + 0.75 + 0.75x + x2 = 0 + 0.75

Combine like terms: -0.75 + 0.75 = 0.00
0.00 + 0.75x + x2 = 0 + 0.75
0.75x + x2 = 0 + 0.75

Combine like terms: 0 + 0.75 = 0.75
0.75x + x2 = 0.75

The x term is 0.75x.  Take half its coefficient (0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
0.75x + 0.140625 + x2 = 0.75 + 0.140625

Reorder the terms:
0.140625 + 0.75x + x2 = 0.75 + 0.140625

Combine like terms: 0.75 + 0.140625 = 0.890625
0.140625 + 0.75x + x2 = 0.890625

Factor a perfect square on the left side:
(x + 0.375)(x + 0.375) = 0.890625

Calculate the square root of the right side: 0.943729304

Break this problem into two subproblems by setting 
(x + 0.375) equal to 0.943729304 and -0.943729304.

Subproblem 1

x + 0.375 = 0.943729304 Simplifying x + 0.375 = 0.943729304 Reorder the terms: 0.375 + x = 0.943729304 Solving 0.375 + x = 0.943729304 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.375' to each side of the equation. 0.375 + -0.375 + x = 0.943729304 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + x = 0.943729304 + -0.375 x = 0.943729304 + -0.375 Combine like terms: 0.943729304 + -0.375 = 0.568729304 x = 0.568729304 Simplifying x = 0.568729304

Subproblem 2

x + 0.375 = -0.943729304 Simplifying x + 0.375 = -0.943729304 Reorder the terms: 0.375 + x = -0.943729304 Solving 0.375 + x = -0.943729304 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.375' to each side of the equation. 0.375 + -0.375 + x = -0.943729304 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + x = -0.943729304 + -0.375 x = -0.943729304 + -0.375 Combine like terms: -0.943729304 + -0.375 = -1.318729304 x = -1.318729304 Simplifying x = -1.318729304

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.568729304, -1.318729304}

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