(3x^2+5x-6)-(-2x^2-6x+7)=

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Solution for (3x^2+5x-6)-(-2x^2-6x+7)= equation:


Simplifying
(3x2 + 5x + -6) + -1(-2x2 + -6x + 7) = 0

Reorder the terms:
(-6 + 5x + 3x2) + -1(-2x2 + -6x + 7) = 0

Remove parenthesis around (-6 + 5x + 3x2)
-6 + 5x + 3x2 + -1(-2x2 + -6x + 7) = 0

Reorder the terms:
-6 + 5x + 3x2 + -1(7 + -6x + -2x2) = 0
-6 + 5x + 3x2 + (7 * -1 + -6x * -1 + -2x2 * -1) = 0
-6 + 5x + 3x2 + (-7 + 6x + 2x2) = 0

Reorder the terms:
-6 + -7 + 5x + 6x + 3x2 + 2x2 = 0

Combine like terms: -6 + -7 = -13
-13 + 5x + 6x + 3x2 + 2x2 = 0

Combine like terms: 5x + 6x = 11x
-13 + 11x + 3x2 + 2x2 = 0

Combine like terms: 3x2 + 2x2 = 5x2
-13 + 11x + 5x2 = 0

Solving
-13 + 11x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-2.6 + 2.2x + x2 = 0

Move the constant term to the right:

Add '2.6' to each side of the equation.
-2.6 + 2.2x + 2.6 + x2 = 0 + 2.6

Reorder the terms:
-2.6 + 2.6 + 2.2x + x2 = 0 + 2.6

Combine like terms: -2.6 + 2.6 = 0.0
0.0 + 2.2x + x2 = 0 + 2.6
2.2x + x2 = 0 + 2.6

Combine like terms: 0 + 2.6 = 2.6
2.2x + x2 = 2.6

The x term is 2.2x.  Take half its coefficient (1.1).
Square it (1.21) and add it to both sides.

Add '1.21' to each side of the equation.
2.2x + 1.21 + x2 = 2.6 + 1.21

Reorder the terms:
1.21 + 2.2x + x2 = 2.6 + 1.21

Combine like terms: 2.6 + 1.21 = 3.81
1.21 + 2.2x + x2 = 3.81

Factor a perfect square on the left side:
(x + 1.1)(x + 1.1) = 3.81

Calculate the square root of the right side: 1.95192213

Break this problem into two subproblems by setting 
(x + 1.1) equal to 1.95192213 and -1.95192213.

Subproblem 1

x + 1.1 = 1.95192213 Simplifying x + 1.1 = 1.95192213 Reorder the terms: 1.1 + x = 1.95192213 Solving 1.1 + x = 1.95192213 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.1' to each side of the equation. 1.1 + -1.1 + x = 1.95192213 + -1.1 Combine like terms: 1.1 + -1.1 = 0.0 0.0 + x = 1.95192213 + -1.1 x = 1.95192213 + -1.1 Combine like terms: 1.95192213 + -1.1 = 0.85192213 x = 0.85192213 Simplifying x = 0.85192213

Subproblem 2

x + 1.1 = -1.95192213 Simplifying x + 1.1 = -1.95192213 Reorder the terms: 1.1 + x = -1.95192213 Solving 1.1 + x = -1.95192213 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.1' to each side of the equation. 1.1 + -1.1 + x = -1.95192213 + -1.1 Combine like terms: 1.1 + -1.1 = 0.0 0.0 + x = -1.95192213 + -1.1 x = -1.95192213 + -1.1 Combine like terms: -1.95192213 + -1.1 = -3.05192213 x = -3.05192213 Simplifying x = -3.05192213

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.85192213, -3.05192213}

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