3x^2-5x-4-6x+8-x^2=

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Solution for 3x^2-5x-4-6x+8-x^2= equation:


Simplifying
3x2 + -5x + -4 + -6x + 8 + -1x2 = 0

Reorder the terms:
-4 + 8 + -5x + -6x + 3x2 + -1x2 = 0

Combine like terms: -4 + 8 = 4
4 + -5x + -6x + 3x2 + -1x2 = 0

Combine like terms: -5x + -6x = -11x
4 + -11x + 3x2 + -1x2 = 0

Combine like terms: 3x2 + -1x2 = 2x2
4 + -11x + 2x2 = 0

Solving
4 + -11x + 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'.
2 + -5.5x + x2 = 0

Move the constant term to the right:

Add '-2' to each side of the equation.
2 + -5.5x + -2 + x2 = 0 + -2

Reorder the terms:
2 + -2 + -5.5x + x2 = 0 + -2

Combine like terms: 2 + -2 = 0
0 + -5.5x + x2 = 0 + -2
-5.5x + x2 = 0 + -2

Combine like terms: 0 + -2 = -2
-5.5x + x2 = -2

The x term is -5.5x.  Take half its coefficient (-2.75).
Square it (7.5625) and add it to both sides.

Add '7.5625' to each side of the equation.
-5.5x + 7.5625 + x2 = -2 + 7.5625

Reorder the terms:
7.5625 + -5.5x + x2 = -2 + 7.5625

Combine like terms: -2 + 7.5625 = 5.5625
7.5625 + -5.5x + x2 = 5.5625

Factor a perfect square on the left side:
(x + -2.75)(x + -2.75) = 5.5625

Calculate the square root of the right side: 2.358495283

Break this problem into two subproblems by setting 
(x + -2.75) equal to 2.358495283 and -2.358495283.

Subproblem 1

x + -2.75 = 2.358495283 Simplifying x + -2.75 = 2.358495283 Reorder the terms: -2.75 + x = 2.358495283 Solving -2.75 + x = 2.358495283 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.75' to each side of the equation. -2.75 + 2.75 + x = 2.358495283 + 2.75 Combine like terms: -2.75 + 2.75 = 0.00 0.00 + x = 2.358495283 + 2.75 x = 2.358495283 + 2.75 Combine like terms: 2.358495283 + 2.75 = 5.108495283 x = 5.108495283 Simplifying x = 5.108495283

Subproblem 2

x + -2.75 = -2.358495283 Simplifying x + -2.75 = -2.358495283 Reorder the terms: -2.75 + x = -2.358495283 Solving -2.75 + x = -2.358495283 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.75' to each side of the equation. -2.75 + 2.75 + x = -2.358495283 + 2.75 Combine like terms: -2.75 + 2.75 = 0.00 0.00 + x = -2.358495283 + 2.75 x = -2.358495283 + 2.75 Combine like terms: -2.358495283 + 2.75 = 0.391504717 x = 0.391504717 Simplifying x = 0.391504717

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.108495283, 0.391504717}

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