3x^2-8x+4=768

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Solution for 3x^2-8x+4=768 equation:


Simplifying
3x2 + -8x + 4 = 768

Reorder the terms:
4 + -8x + 3x2 = 768

Solving
4 + -8x + 3x2 = 768

Solving for variable 'x'.

Reorder the terms:
4 + -768 + -8x + 3x2 = 768 + -768

Combine like terms: 4 + -768 = -764
-764 + -8x + 3x2 = 768 + -768

Combine like terms: 768 + -768 = 0
-764 + -8x + 3x2 = 0

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

Divide each side by '3'.
-254.6666667 + -2.666666667x + x2 = 0

Move the constant term to the right:

Add '254.6666667' to each side of the equation.
-254.6666667 + -2.666666667x + 254.6666667 + x2 = 0 + 254.6666667

Reorder the terms:
-254.6666667 + 254.6666667 + -2.666666667x + x2 = 0 + 254.6666667

Combine like terms: -254.6666667 + 254.6666667 = 0.0000000
0.0000000 + -2.666666667x + x2 = 0 + 254.6666667
-2.666666667x + x2 = 0 + 254.6666667

Combine like terms: 0 + 254.6666667 = 254.6666667
-2.666666667x + x2 = 254.6666667

The x term is -2.666666667x.  Take half its coefficient (-1.333333334).
Square it (1.777777780) and add it to both sides.

Add '1.777777780' to each side of the equation.
-2.666666667x + 1.777777780 + x2 = 254.6666667 + 1.777777780

Reorder the terms:
1.777777780 + -2.666666667x + x2 = 254.6666667 + 1.777777780

Combine like terms: 254.6666667 + 1.777777780 = 256.44444448
1.777777780 + -2.666666667x + x2 = 256.44444448

Factor a perfect square on the left side:
(x + -1.333333334)(x + -1.333333334) = 256.44444448

Calculate the square root of the right side: 16.013882867

Break this problem into two subproblems by setting 
(x + -1.333333334) equal to 16.013882867 and -16.013882867.

Subproblem 1

x + -1.333333334 = 16.013882867 Simplifying x + -1.333333334 = 16.013882867 Reorder the terms: -1.333333334 + x = 16.013882867 Solving -1.333333334 + x = 16.013882867 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.333333334' to each side of the equation. -1.333333334 + 1.333333334 + x = 16.013882867 + 1.333333334 Combine like terms: -1.333333334 + 1.333333334 = 0.000000000 0.000000000 + x = 16.013882867 + 1.333333334 x = 16.013882867 + 1.333333334 Combine like terms: 16.013882867 + 1.333333334 = 17.347216201 x = 17.347216201 Simplifying x = 17.347216201

Subproblem 2

x + -1.333333334 = -16.013882867 Simplifying x + -1.333333334 = -16.013882867 Reorder the terms: -1.333333334 + x = -16.013882867 Solving -1.333333334 + x = -16.013882867 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.333333334' to each side of the equation. -1.333333334 + 1.333333334 + x = -16.013882867 + 1.333333334 Combine like terms: -1.333333334 + 1.333333334 = 0.000000000 0.000000000 + x = -16.013882867 + 1.333333334 x = -16.013882867 + 1.333333334 Combine like terms: -16.013882867 + 1.333333334 = -14.680549533 x = -14.680549533 Simplifying x = -14.680549533

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.347216201, -14.680549533}

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