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

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


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

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

Combine like terms: -5 + 6 = 1
1 + -2x + -7x + 3x2 + -1x2 = 0

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

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

Solving
1 + -9x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
0.5 + -4.5x + x2 = 0

Move the constant term to the right:

Add '-0.5' to each side of the equation.
0.5 + -4.5x + -0.5 + x2 = 0 + -0.5

Reorder the terms:
0.5 + -0.5 + -4.5x + x2 = 0 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + -4.5x + x2 = 0 + -0.5
-4.5x + x2 = 0 + -0.5

Combine like terms: 0 + -0.5 = -0.5
-4.5x + x2 = -0.5

The x term is -4.5x.  Take half its coefficient (-2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
-4.5x + 5.0625 + x2 = -0.5 + 5.0625

Reorder the terms:
5.0625 + -4.5x + x2 = -0.5 + 5.0625

Combine like terms: -0.5 + 5.0625 = 4.5625
5.0625 + -4.5x + x2 = 4.5625

Factor a perfect square on the left side:
(x + -2.25)(x + -2.25) = 4.5625

Calculate the square root of the right side: 2.136000936

Break this problem into two subproblems by setting 
(x + -2.25) equal to 2.136000936 and -2.136000936.

Subproblem 1

x + -2.25 = 2.136000936 Simplifying x + -2.25 = 2.136000936 Reorder the terms: -2.25 + x = 2.136000936 Solving -2.25 + x = 2.136000936 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x = 2.136000936 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = 2.136000936 + 2.25 x = 2.136000936 + 2.25 Combine like terms: 2.136000936 + 2.25 = 4.386000936 x = 4.386000936 Simplifying x = 4.386000936

Subproblem 2

x + -2.25 = -2.136000936 Simplifying x + -2.25 = -2.136000936 Reorder the terms: -2.25 + x = -2.136000936 Solving -2.25 + x = -2.136000936 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + x = -2.136000936 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + x = -2.136000936 + 2.25 x = -2.136000936 + 2.25 Combine like terms: -2.136000936 + 2.25 = 0.113999064 x = 0.113999064 Simplifying x = 0.113999064

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.386000936, 0.113999064}

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