3x(2x-1)-7=0

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Solution for 3x(2x-1)-7=0 equation:


Simplifying
3x(2x + -1) + -7 = 0

Reorder the terms:
3x(-1 + 2x) + -7 = 0
(-1 * 3x + 2x * 3x) + -7 = 0
(-3x + 6x2) + -7 = 0

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

Solving
-7 + -3x + 6x2 = 0

Solving for variable 'x'.

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

Divide each side by '6'.
-1.166666667 + -0.5x + x2 = 0

Move the constant term to the right:

Add '1.166666667' to each side of the equation.
-1.166666667 + -0.5x + 1.166666667 + x2 = 0 + 1.166666667

Reorder the terms:
-1.166666667 + 1.166666667 + -0.5x + x2 = 0 + 1.166666667

Combine like terms: -1.166666667 + 1.166666667 = 0.000000000
0.000000000 + -0.5x + x2 = 0 + 1.166666667
-0.5x + x2 = 0 + 1.166666667

Combine like terms: 0 + 1.166666667 = 1.166666667
-0.5x + x2 = 1.166666667

The x term is -0.5x.  Take half its coefficient (-0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
-0.5x + 0.0625 + x2 = 1.166666667 + 0.0625

Reorder the terms:
0.0625 + -0.5x + x2 = 1.166666667 + 0.0625

Combine like terms: 1.166666667 + 0.0625 = 1.229166667
0.0625 + -0.5x + x2 = 1.229166667

Factor a perfect square on the left side:
(x + -0.25)(x + -0.25) = 1.229166667

Calculate the square root of the right side: 1.108677891

Break this problem into two subproblems by setting 
(x + -0.25) equal to 1.108677891 and -1.108677891.

Subproblem 1

x + -0.25 = 1.108677891 Simplifying x + -0.25 = 1.108677891 Reorder the terms: -0.25 + x = 1.108677891 Solving -0.25 + x = 1.108677891 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = 1.108677891 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = 1.108677891 + 0.25 x = 1.108677891 + 0.25 Combine like terms: 1.108677891 + 0.25 = 1.358677891 x = 1.358677891 Simplifying x = 1.358677891

Subproblem 2

x + -0.25 = -1.108677891 Simplifying x + -0.25 = -1.108677891 Reorder the terms: -0.25 + x = -1.108677891 Solving -0.25 + x = -1.108677891 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = -1.108677891 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = -1.108677891 + 0.25 x = -1.108677891 + 0.25 Combine like terms: -1.108677891 + 0.25 = -0.858677891 x = -0.858677891 Simplifying x = -0.858677891

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.358677891, -0.858677891}

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