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

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


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

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

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

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

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

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

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

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

Solving
-2 + -6x + 3x2 = 0

Solving for variable 'x'.

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

Divide each side by '3'.
-0.6666666667 + -2x + x2 = 0

Move the constant term to the right:

Add '0.6666666667' to each side of the equation.
-0.6666666667 + -2x + 0.6666666667 + x2 = 0 + 0.6666666667

Reorder the terms:
-0.6666666667 + 0.6666666667 + -2x + x2 = 0 + 0.6666666667

Combine like terms: -0.6666666667 + 0.6666666667 = 0.0000000000
0.0000000000 + -2x + x2 = 0 + 0.6666666667
-2x + x2 = 0 + 0.6666666667

Combine like terms: 0 + 0.6666666667 = 0.6666666667
-2x + x2 = 0.6666666667

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = 0.6666666667 + 1

Reorder the terms:
1 + -2x + x2 = 0.6666666667 + 1

Combine like terms: 0.6666666667 + 1 = 1.6666666667
1 + -2x + x2 = 1.6666666667

Factor a perfect square on the left side:
(x + -1)(x + -1) = 1.6666666667

Calculate the square root of the right side: 1.290994449

Break this problem into two subproblems by setting 
(x + -1) equal to 1.290994449 and -1.290994449.

Subproblem 1

x + -1 = 1.290994449 Simplifying x + -1 = 1.290994449 Reorder the terms: -1 + x = 1.290994449 Solving -1 + x = 1.290994449 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 1.290994449 + 1 Combine like terms: -1 + 1 = 0 0 + x = 1.290994449 + 1 x = 1.290994449 + 1 Combine like terms: 1.290994449 + 1 = 2.290994449 x = 2.290994449 Simplifying x = 2.290994449

Subproblem 2

x + -1 = -1.290994449 Simplifying x + -1 = -1.290994449 Reorder the terms: -1 + x = -1.290994449 Solving -1 + x = -1.290994449 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -1.290994449 + 1 Combine like terms: -1 + 1 = 0 0 + x = -1.290994449 + 1 x = -1.290994449 + 1 Combine like terms: -1.290994449 + 1 = -0.290994449 x = -0.290994449 Simplifying x = -0.290994449

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.290994449, -0.290994449}

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