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

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


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

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

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

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

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

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

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

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

Solving
-2 + 5x + 9x2 = 0

Solving for variable 'x'.

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

Divide each side by '9'.
-0.2222222222 + 0.5555555556x + x2 = 0

Move the constant term to the right:

Add '0.2222222222' to each side of the equation.
-0.2222222222 + 0.5555555556x + 0.2222222222 + x2 = 0 + 0.2222222222

Reorder the terms:
-0.2222222222 + 0.2222222222 + 0.5555555556x + x2 = 0 + 0.2222222222

Combine like terms: -0.2222222222 + 0.2222222222 = 0.0000000000
0.0000000000 + 0.5555555556x + x2 = 0 + 0.2222222222
0.5555555556x + x2 = 0 + 0.2222222222

Combine like terms: 0 + 0.2222222222 = 0.2222222222
0.5555555556x + x2 = 0.2222222222

The x term is 0.5555555556x.  Take half its coefficient (0.2777777778).
Square it (0.07716049384) and add it to both sides.

Add '0.07716049384' to each side of the equation.
0.5555555556x + 0.07716049384 + x2 = 0.2222222222 + 0.07716049384

Reorder the terms:
0.07716049384 + 0.5555555556x + x2 = 0.2222222222 + 0.07716049384

Combine like terms: 0.2222222222 + 0.07716049384 = 0.29938271604
0.07716049384 + 0.5555555556x + x2 = 0.29938271604

Factor a perfect square on the left side:
(x + 0.2777777778)(x + 0.2777777778) = 0.29938271604

Calculate the square root of the right side: 0.547158767

Break this problem into two subproblems by setting 
(x + 0.2777777778) equal to 0.547158767 and -0.547158767.

Subproblem 1

x + 0.2777777778 = 0.547158767 Simplifying x + 0.2777777778 = 0.547158767 Reorder the terms: 0.2777777778 + x = 0.547158767 Solving 0.2777777778 + x = 0.547158767 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2777777778' to each side of the equation. 0.2777777778 + -0.2777777778 + x = 0.547158767 + -0.2777777778 Combine like terms: 0.2777777778 + -0.2777777778 = 0.0000000000 0.0000000000 + x = 0.547158767 + -0.2777777778 x = 0.547158767 + -0.2777777778 Combine like terms: 0.547158767 + -0.2777777778 = 0.2693809892 x = 0.2693809892 Simplifying x = 0.2693809892

Subproblem 2

x + 0.2777777778 = -0.547158767 Simplifying x + 0.2777777778 = -0.547158767 Reorder the terms: 0.2777777778 + x = -0.547158767 Solving 0.2777777778 + x = -0.547158767 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2777777778' to each side of the equation. 0.2777777778 + -0.2777777778 + x = -0.547158767 + -0.2777777778 Combine like terms: 0.2777777778 + -0.2777777778 = 0.0000000000 0.0000000000 + x = -0.547158767 + -0.2777777778 x = -0.547158767 + -0.2777777778 Combine like terms: -0.547158767 + -0.2777777778 = -0.8249365448 x = -0.8249365448 Simplifying x = -0.8249365448

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.2693809892, -0.8249365448}

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