3x(4x-3)=11

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Solution for 3x(4x-3)=11 equation:


Simplifying
3x(4x + -3) = 11

Reorder the terms:
3x(-3 + 4x) = 11
(-3 * 3x + 4x * 3x) = 11
(-9x + 12x2) = 11

Solving
-9x + 12x2 = 11

Solving for variable 'x'.

Reorder the terms:
-11 + -9x + 12x2 = 11 + -11

Combine like terms: 11 + -11 = 0
-11 + -9x + 12x2 = 0

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

Divide each side by '12'.
-0.9166666667 + -0.75x + x2 = 0

Move the constant term to the right:

Add '0.9166666667' to each side of the equation.
-0.9166666667 + -0.75x + 0.9166666667 + x2 = 0 + 0.9166666667

Reorder the terms:
-0.9166666667 + 0.9166666667 + -0.75x + x2 = 0 + 0.9166666667

Combine like terms: -0.9166666667 + 0.9166666667 = 0.0000000000
0.0000000000 + -0.75x + x2 = 0 + 0.9166666667
-0.75x + x2 = 0 + 0.9166666667

Combine like terms: 0 + 0.9166666667 = 0.9166666667
-0.75x + x2 = 0.9166666667

The x term is -0.75x.  Take half its coefficient (-0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
-0.75x + 0.140625 + x2 = 0.9166666667 + 0.140625

Reorder the terms:
0.140625 + -0.75x + x2 = 0.9166666667 + 0.140625

Combine like terms: 0.9166666667 + 0.140625 = 1.0572916667
0.140625 + -0.75x + x2 = 1.0572916667

Factor a perfect square on the left side:
(x + -0.375)(x + -0.375) = 1.0572916667

Calculate the square root of the right side: 1.02824689

Break this problem into two subproblems by setting 
(x + -0.375) equal to 1.02824689 and -1.02824689.

Subproblem 1

x + -0.375 = 1.02824689 Simplifying x + -0.375 = 1.02824689 Reorder the terms: -0.375 + x = 1.02824689 Solving -0.375 + x = 1.02824689 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + x = 1.02824689 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + x = 1.02824689 + 0.375 x = 1.02824689 + 0.375 Combine like terms: 1.02824689 + 0.375 = 1.40324689 x = 1.40324689 Simplifying x = 1.40324689

Subproblem 2

x + -0.375 = -1.02824689 Simplifying x + -0.375 = -1.02824689 Reorder the terms: -0.375 + x = -1.02824689 Solving -0.375 + x = -1.02824689 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + x = -1.02824689 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + x = -1.02824689 + 0.375 x = -1.02824689 + 0.375 Combine like terms: -1.02824689 + 0.375 = -0.65324689 x = -0.65324689 Simplifying x = -0.65324689

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.40324689, -0.65324689}

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