(3x^2-5x-5)+(9x^2+2x+1)=

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Solution for (3x^2-5x-5)+(9x^2+2x+1)= equation:


Simplifying
(3x2 + -5x + -5) + (9x2 + 2x + 1) = 0

Reorder the terms:
(-5 + -5x + 3x2) + (9x2 + 2x + 1) = 0

Remove parenthesis around (-5 + -5x + 3x2)
-5 + -5x + 3x2 + (9x2 + 2x + 1) = 0

Reorder the terms:
-5 + -5x + 3x2 + (1 + 2x + 9x2) = 0

Remove parenthesis around (1 + 2x + 9x2)
-5 + -5x + 3x2 + 1 + 2x + 9x2 = 0

Reorder the terms:
-5 + 1 + -5x + 2x + 3x2 + 9x2 = 0

Combine like terms: -5 + 1 = -4
-4 + -5x + 2x + 3x2 + 9x2 = 0

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

Combine like terms: 3x2 + 9x2 = 12x2
-4 + -3x + 12x2 = 0

Solving
-4 + -3x + 12x2 = 0

Solving for variable 'x'.

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

Divide each side by '12'.
-0.3333333333 + -0.25x + x2 = 0

Move the constant term to the right:

Add '0.3333333333' to each side of the equation.
-0.3333333333 + -0.25x + 0.3333333333 + x2 = 0 + 0.3333333333

Reorder the terms:
-0.3333333333 + 0.3333333333 + -0.25x + x2 = 0 + 0.3333333333

Combine like terms: -0.3333333333 + 0.3333333333 = 0.0000000000
0.0000000000 + -0.25x + x2 = 0 + 0.3333333333
-0.25x + x2 = 0 + 0.3333333333

Combine like terms: 0 + 0.3333333333 = 0.3333333333
-0.25x + x2 = 0.3333333333

The x term is -0.25x.  Take half its coefficient (-0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
-0.25x + 0.015625 + x2 = 0.3333333333 + 0.015625

Reorder the terms:
0.015625 + -0.25x + x2 = 0.3333333333 + 0.015625

Combine like terms: 0.3333333333 + 0.015625 = 0.3489583333
0.015625 + -0.25x + x2 = 0.3489583333

Factor a perfect square on the left side:
(x + -0.125)(x + -0.125) = 0.3489583333

Calculate the square root of the right side: 0.590726953

Break this problem into two subproblems by setting 
(x + -0.125) equal to 0.590726953 and -0.590726953.

Subproblem 1

x + -0.125 = 0.590726953 Simplifying x + -0.125 = 0.590726953 Reorder the terms: -0.125 + x = 0.590726953 Solving -0.125 + x = 0.590726953 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + x = 0.590726953 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + x = 0.590726953 + 0.125 x = 0.590726953 + 0.125 Combine like terms: 0.590726953 + 0.125 = 0.715726953 x = 0.715726953 Simplifying x = 0.715726953

Subproblem 2

x + -0.125 = -0.590726953 Simplifying x + -0.125 = -0.590726953 Reorder the terms: -0.125 + x = -0.590726953 Solving -0.125 + x = -0.590726953 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + x = -0.590726953 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + x = -0.590726953 + 0.125 x = -0.590726953 + 0.125 Combine like terms: -0.590726953 + 0.125 = -0.465726953 x = -0.465726953 Simplifying x = -0.465726953

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.715726953, -0.465726953}

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