(5x^2-4x+2)+(3x^2+9x-8)=

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Solution for (5x^2-4x+2)+(3x^2+9x-8)= equation:


Simplifying
(5x2 + -4x + 2) + (3x2 + 9x + -8) = 0

Reorder the terms:
(2 + -4x + 5x2) + (3x2 + 9x + -8) = 0

Remove parenthesis around (2 + -4x + 5x2)
2 + -4x + 5x2 + (3x2 + 9x + -8) = 0

Reorder the terms:
2 + -4x + 5x2 + (-8 + 9x + 3x2) = 0

Remove parenthesis around (-8 + 9x + 3x2)
2 + -4x + 5x2 + -8 + 9x + 3x2 = 0

Reorder the terms:
2 + -8 + -4x + 9x + 5x2 + 3x2 = 0

Combine like terms: 2 + -8 = -6
-6 + -4x + 9x + 5x2 + 3x2 = 0

Combine like terms: -4x + 9x = 5x
-6 + 5x + 5x2 + 3x2 = 0

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

Solving
-6 + 5x + 8x2 = 0

Solving for variable 'x'.

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

Divide each side by '8'.
-0.75 + 0.625x + x2 = 0

Move the constant term to the right:

Add '0.75' to each side of the equation.
-0.75 + 0.625x + 0.75 + x2 = 0 + 0.75

Reorder the terms:
-0.75 + 0.75 + 0.625x + x2 = 0 + 0.75

Combine like terms: -0.75 + 0.75 = 0.00
0.00 + 0.625x + x2 = 0 + 0.75
0.625x + x2 = 0 + 0.75

Combine like terms: 0 + 0.75 = 0.75
0.625x + x2 = 0.75

The x term is 0.625x.  Take half its coefficient (0.3125).
Square it (0.09765625) and add it to both sides.

Add '0.09765625' to each side of the equation.
0.625x + 0.09765625 + x2 = 0.75 + 0.09765625

Reorder the terms:
0.09765625 + 0.625x + x2 = 0.75 + 0.09765625

Combine like terms: 0.75 + 0.09765625 = 0.84765625
0.09765625 + 0.625x + x2 = 0.84765625

Factor a perfect square on the left side:
(x + 0.3125)(x + 0.3125) = 0.84765625

Calculate the square root of the right side: 0.920682491

Break this problem into two subproblems by setting 
(x + 0.3125) equal to 0.920682491 and -0.920682491.

Subproblem 1

x + 0.3125 = 0.920682491 Simplifying x + 0.3125 = 0.920682491 Reorder the terms: 0.3125 + x = 0.920682491 Solving 0.3125 + x = 0.920682491 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3125' to each side of the equation. 0.3125 + -0.3125 + x = 0.920682491 + -0.3125 Combine like terms: 0.3125 + -0.3125 = 0.0000 0.0000 + x = 0.920682491 + -0.3125 x = 0.920682491 + -0.3125 Combine like terms: 0.920682491 + -0.3125 = 0.608182491 x = 0.608182491 Simplifying x = 0.608182491

Subproblem 2

x + 0.3125 = -0.920682491 Simplifying x + 0.3125 = -0.920682491 Reorder the terms: 0.3125 + x = -0.920682491 Solving 0.3125 + x = -0.920682491 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3125' to each side of the equation. 0.3125 + -0.3125 + x = -0.920682491 + -0.3125 Combine like terms: 0.3125 + -0.3125 = 0.0000 0.0000 + x = -0.920682491 + -0.3125 x = -0.920682491 + -0.3125 Combine like terms: -0.920682491 + -0.3125 = -1.233182491 x = -1.233182491 Simplifying x = -1.233182491

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.608182491, -1.233182491}

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