(3x^2-6x-7)+(-2x^2-4x+12)=

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Solution for (3x^2-6x-7)+(-2x^2-4x+12)= equation:


Simplifying
(3x2 + -6x + -7) + (-2x2 + -4x + 12) = 0

Reorder the terms:
(-7 + -6x + 3x2) + (-2x2 + -4x + 12) = 0

Remove parenthesis around (-7 + -6x + 3x2)
-7 + -6x + 3x2 + (-2x2 + -4x + 12) = 0

Reorder the terms:
-7 + -6x + 3x2 + (12 + -4x + -2x2) = 0

Remove parenthesis around (12 + -4x + -2x2)
-7 + -6x + 3x2 + 12 + -4x + -2x2 = 0

Reorder the terms:
-7 + 12 + -6x + -4x + 3x2 + -2x2 = 0

Combine like terms: -7 + 12 = 5
5 + -6x + -4x + 3x2 + -2x2 = 0

Combine like terms: -6x + -4x = -10x
5 + -10x + 3x2 + -2x2 = 0

Combine like terms: 3x2 + -2x2 = 1x2
5 + -10x + 1x2 = 0

Solving
5 + -10x + 1x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-5' to each side of the equation.
5 + -10x + -5 + x2 = 0 + -5

Reorder the terms:
5 + -5 + -10x + x2 = 0 + -5

Combine like terms: 5 + -5 = 0
0 + -10x + x2 = 0 + -5
-10x + x2 = 0 + -5

Combine like terms: 0 + -5 = -5
-10x + x2 = -5

The x term is -10x.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10x + 25 + x2 = -5 + 25

Reorder the terms:
25 + -10x + x2 = -5 + 25

Combine like terms: -5 + 25 = 20
25 + -10x + x2 = 20

Factor a perfect square on the left side:
(x + -5)(x + -5) = 20

Calculate the square root of the right side: 4.472135955

Break this problem into two subproblems by setting 
(x + -5) equal to 4.472135955 and -4.472135955.

Subproblem 1

x + -5 = 4.472135955 Simplifying x + -5 = 4.472135955 Reorder the terms: -5 + x = 4.472135955 Solving -5 + x = 4.472135955 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = 4.472135955 + 5 Combine like terms: -5 + 5 = 0 0 + x = 4.472135955 + 5 x = 4.472135955 + 5 Combine like terms: 4.472135955 + 5 = 9.472135955 x = 9.472135955 Simplifying x = 9.472135955

Subproblem 2

x + -5 = -4.472135955 Simplifying x + -5 = -4.472135955 Reorder the terms: -5 + x = -4.472135955 Solving -5 + x = -4.472135955 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + x = -4.472135955 + 5 Combine like terms: -5 + 5 = 0 0 + x = -4.472135955 + 5 x = -4.472135955 + 5 Combine like terms: -4.472135955 + 5 = 0.527864045 x = 0.527864045 Simplifying x = 0.527864045

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.472135955, 0.527864045}

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