12x^2+2-3x-5x^2-8x=

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Solution for 12x^2+2-3x-5x^2-8x= equation:


Simplifying
12x2 + 2 + -3x + -5x2 + -8x = 0

Reorder the terms:
2 + -3x + -8x + 12x2 + -5x2 = 0

Combine like terms: -3x + -8x = -11x
2 + -11x + 12x2 + -5x2 = 0

Combine like terms: 12x2 + -5x2 = 7x2
2 + -11x + 7x2 = 0

Solving
2 + -11x + 7x2 = 0

Solving for variable 'x'.

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

Divide each side by '7'.
0.2857142857 + -1.571428571x + x2 = 0

Move the constant term to the right:

Add '-0.2857142857' to each side of the equation.
0.2857142857 + -1.571428571x + -0.2857142857 + x2 = 0 + -0.2857142857

Reorder the terms:
0.2857142857 + -0.2857142857 + -1.571428571x + x2 = 0 + -0.2857142857

Combine like terms: 0.2857142857 + -0.2857142857 = 0.0000000000
0.0000000000 + -1.571428571x + x2 = 0 + -0.2857142857
-1.571428571x + x2 = 0 + -0.2857142857

Combine like terms: 0 + -0.2857142857 = -0.2857142857
-1.571428571x + x2 = -0.2857142857

The x term is -1.571428571x.  Take half its coefficient (-0.7857142855).
Square it (0.6173469384) and add it to both sides.

Add '0.6173469384' to each side of the equation.
-1.571428571x + 0.6173469384 + x2 = -0.2857142857 + 0.6173469384

Reorder the terms:
0.6173469384 + -1.571428571x + x2 = -0.2857142857 + 0.6173469384

Combine like terms: -0.2857142857 + 0.6173469384 = 0.3316326527
0.6173469384 + -1.571428571x + x2 = 0.3316326527

Factor a perfect square on the left side:
(x + -0.7857142855)(x + -0.7857142855) = 0.3316326527

Calculate the square root of the right side: 0.575875553

Break this problem into two subproblems by setting 
(x + -0.7857142855) equal to 0.575875553 and -0.575875553.

Subproblem 1

x + -0.7857142855 = 0.575875553 Simplifying x + -0.7857142855 = 0.575875553 Reorder the terms: -0.7857142855 + x = 0.575875553 Solving -0.7857142855 + x = 0.575875553 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.7857142855' to each side of the equation. -0.7857142855 + 0.7857142855 + x = 0.575875553 + 0.7857142855 Combine like terms: -0.7857142855 + 0.7857142855 = 0.0000000000 0.0000000000 + x = 0.575875553 + 0.7857142855 x = 0.575875553 + 0.7857142855 Combine like terms: 0.575875553 + 0.7857142855 = 1.3615898385 x = 1.3615898385 Simplifying x = 1.3615898385

Subproblem 2

x + -0.7857142855 = -0.575875553 Simplifying x + -0.7857142855 = -0.575875553 Reorder the terms: -0.7857142855 + x = -0.575875553 Solving -0.7857142855 + x = -0.575875553 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.7857142855' to each side of the equation. -0.7857142855 + 0.7857142855 + x = -0.575875553 + 0.7857142855 Combine like terms: -0.7857142855 + 0.7857142855 = 0.0000000000 0.0000000000 + x = -0.575875553 + 0.7857142855 x = -0.575875553 + 0.7857142855 Combine like terms: -0.575875553 + 0.7857142855 = 0.2098387325 x = 0.2098387325 Simplifying x = 0.2098387325

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.3615898385, 0.2098387325}

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