0=-6x^2+7x+4

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Solution for 0=-6x^2+7x+4 equation:


Simplifying
0 = -6x2 + 7x + 4

Reorder the terms:
0 = 4 + 7x + -6x2

Solving
0 = 4 + 7x + -6x2

Solving for variable 'x'.

Combine like terms: 0 + -4 = -4
-4 + -7x + 6x2 = 4 + 7x + -6x2 + -4 + -7x + 6x2

Reorder the terms:
-4 + -7x + 6x2 = 4 + -4 + 7x + -7x + -6x2 + 6x2

Combine like terms: 4 + -4 = 0
-4 + -7x + 6x2 = 0 + 7x + -7x + -6x2 + 6x2
-4 + -7x + 6x2 = 7x + -7x + -6x2 + 6x2

Combine like terms: 7x + -7x = 0
-4 + -7x + 6x2 = 0 + -6x2 + 6x2
-4 + -7x + 6x2 = -6x2 + 6x2

Combine like terms: -6x2 + 6x2 = 0
-4 + -7x + 6x2 = 0

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

Divide each side by '6'.
-0.6666666667 + -1.166666667x + x2 = 0

Move the constant term to the right:

Add '0.6666666667' to each side of the equation.
-0.6666666667 + -1.166666667x + 0.6666666667 + x2 = 0 + 0.6666666667

Reorder the terms:
-0.6666666667 + 0.6666666667 + -1.166666667x + x2 = 0 + 0.6666666667

Combine like terms: -0.6666666667 + 0.6666666667 = 0.0000000000
0.0000000000 + -1.166666667x + x2 = 0 + 0.6666666667
-1.166666667x + x2 = 0 + 0.6666666667

Combine like terms: 0 + 0.6666666667 = 0.6666666667
-1.166666667x + x2 = 0.6666666667

The x term is -1.166666667x.  Take half its coefficient (-0.5833333335).
Square it (0.3402777780) and add it to both sides.

Add '0.3402777780' to each side of the equation.
-1.166666667x + 0.3402777780 + x2 = 0.6666666667 + 0.3402777780

Reorder the terms:
0.3402777780 + -1.166666667x + x2 = 0.6666666667 + 0.3402777780

Combine like terms: 0.6666666667 + 0.3402777780 = 1.0069444447
0.3402777780 + -1.166666667x + x2 = 1.0069444447

Factor a perfect square on the left side:
(x + -0.5833333335)(x + -0.5833333335) = 1.0069444447

Calculate the square root of the right side: 1.003466215

Break this problem into two subproblems by setting 
(x + -0.5833333335) equal to 1.003466215 and -1.003466215.

Subproblem 1

x + -0.5833333335 = 1.003466215 Simplifying x + -0.5833333335 = 1.003466215 Reorder the terms: -0.5833333335 + x = 1.003466215 Solving -0.5833333335 + x = 1.003466215 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5833333335' to each side of the equation. -0.5833333335 + 0.5833333335 + x = 1.003466215 + 0.5833333335 Combine like terms: -0.5833333335 + 0.5833333335 = 0.0000000000 0.0000000000 + x = 1.003466215 + 0.5833333335 x = 1.003466215 + 0.5833333335 Combine like terms: 1.003466215 + 0.5833333335 = 1.5867995485 x = 1.5867995485 Simplifying x = 1.5867995485

Subproblem 2

x + -0.5833333335 = -1.003466215 Simplifying x + -0.5833333335 = -1.003466215 Reorder the terms: -0.5833333335 + x = -1.003466215 Solving -0.5833333335 + x = -1.003466215 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5833333335' to each side of the equation. -0.5833333335 + 0.5833333335 + x = -1.003466215 + 0.5833333335 Combine like terms: -0.5833333335 + 0.5833333335 = 0.0000000000 0.0000000000 + x = -1.003466215 + 0.5833333335 x = -1.003466215 + 0.5833333335 Combine like terms: -1.003466215 + 0.5833333335 = -0.4201328815 x = -0.4201328815 Simplifying x = -0.4201328815

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.5867995485, -0.4201328815}

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