(3x^2-2x-7)+(9x^2-7x+6)-(2x^2-2x+4)=

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Solution for (3x^2-2x-7)+(9x^2-7x+6)-(2x^2-2x+4)= equation:


Simplifying
(3x2 + -2x + -7) + (9x2 + -7x + 6) + -1(2x2 + -2x + 4) = 0

Reorder the terms:
(-7 + -2x + 3x2) + (9x2 + -7x + 6) + -1(2x2 + -2x + 4) = 0

Remove parenthesis around (-7 + -2x + 3x2)
-7 + -2x + 3x2 + (9x2 + -7x + 6) + -1(2x2 + -2x + 4) = 0

Reorder the terms:
-7 + -2x + 3x2 + (6 + -7x + 9x2) + -1(2x2 + -2x + 4) = 0

Remove parenthesis around (6 + -7x + 9x2)
-7 + -2x + 3x2 + 6 + -7x + 9x2 + -1(2x2 + -2x + 4) = 0

Reorder the terms:
-7 + -2x + 3x2 + 6 + -7x + 9x2 + -1(4 + -2x + 2x2) = 0
-7 + -2x + 3x2 + 6 + -7x + 9x2 + (4 * -1 + -2x * -1 + 2x2 * -1) = 0
-7 + -2x + 3x2 + 6 + -7x + 9x2 + (-4 + 2x + -2x2) = 0

Reorder the terms:
-7 + 6 + -4 + -2x + -7x + 2x + 3x2 + 9x2 + -2x2 = 0

Combine like terms: -7 + 6 = -1
-1 + -4 + -2x + -7x + 2x + 3x2 + 9x2 + -2x2 = 0

Combine like terms: -1 + -4 = -5
-5 + -2x + -7x + 2x + 3x2 + 9x2 + -2x2 = 0

Combine like terms: -2x + -7x = -9x
-5 + -9x + 2x + 3x2 + 9x2 + -2x2 = 0

Combine like terms: -9x + 2x = -7x
-5 + -7x + 3x2 + 9x2 + -2x2 = 0

Combine like terms: 3x2 + 9x2 = 12x2
-5 + -7x + 12x2 + -2x2 = 0

Combine like terms: 12x2 + -2x2 = 10x2
-5 + -7x + 10x2 = 0

Solving
-5 + -7x + 10x2 = 0

Solving for variable 'x'.

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

Divide each side by '10'.
-0.5 + -0.7x + x2 = 0.0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + -0.7x + 0.5 + x2 = 0.0 + 0.5

Reorder the terms:
-0.5 + 0.5 + -0.7x + x2 = 0.0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + -0.7x + x2 = 0.0 + 0.5
-0.7x + x2 = 0.0 + 0.5

Combine like terms: 0.0 + 0.5 = 0.5
-0.7x + x2 = 0.5

The x term is -0.7x.  Take half its coefficient (-0.35).
Square it (0.1225) and add it to both sides.

Add '0.1225' to each side of the equation.
-0.7x + 0.1225 + x2 = 0.5 + 0.1225

Reorder the terms:
0.1225 + -0.7x + x2 = 0.5 + 0.1225

Combine like terms: 0.5 + 0.1225 = 0.6225
0.1225 + -0.7x + x2 = 0.6225

Factor a perfect square on the left side:
(x + -0.35)(x + -0.35) = 0.6225

Calculate the square root of the right side: 0.788986692

Break this problem into two subproblems by setting 
(x + -0.35) equal to 0.788986692 and -0.788986692.

Subproblem 1

x + -0.35 = 0.788986692 Simplifying x + -0.35 = 0.788986692 Reorder the terms: -0.35 + x = 0.788986692 Solving -0.35 + x = 0.788986692 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.35' to each side of the equation. -0.35 + 0.35 + x = 0.788986692 + 0.35 Combine like terms: -0.35 + 0.35 = 0.00 0.00 + x = 0.788986692 + 0.35 x = 0.788986692 + 0.35 Combine like terms: 0.788986692 + 0.35 = 1.138986692 x = 1.138986692 Simplifying x = 1.138986692

Subproblem 2

x + -0.35 = -0.788986692 Simplifying x + -0.35 = -0.788986692 Reorder the terms: -0.35 + x = -0.788986692 Solving -0.35 + x = -0.788986692 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.35' to each side of the equation. -0.35 + 0.35 + x = -0.788986692 + 0.35 Combine like terms: -0.35 + 0.35 = 0.00 0.00 + x = -0.788986692 + 0.35 x = -0.788986692 + 0.35 Combine like terms: -0.788986692 + 0.35 = -0.438986692 x = -0.438986692 Simplifying x = -0.438986692

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.138986692, -0.438986692}

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