12x^2-15x=11

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Solution for 12x^2-15x=11 equation:


Simplifying
12x2 + -15x = 11

Reorder the terms:
-15x + 12x2 = 11

Solving
-15x + 12x2 = 11

Solving for variable 'x'.

Reorder the terms:
-11 + -15x + 12x2 = 11 + -11

Combine like terms: 11 + -11 = 0
-11 + -15x + 12x2 = 0

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

Divide each side by '12'.
-0.9166666667 + -1.25x + x2 = 0

Move the constant term to the right:

Add '0.9166666667' to each side of the equation.
-0.9166666667 + -1.25x + 0.9166666667 + x2 = 0 + 0.9166666667

Reorder the terms:
-0.9166666667 + 0.9166666667 + -1.25x + x2 = 0 + 0.9166666667

Combine like terms: -0.9166666667 + 0.9166666667 = 0.0000000000
0.0000000000 + -1.25x + x2 = 0 + 0.9166666667
-1.25x + x2 = 0 + 0.9166666667

Combine like terms: 0 + 0.9166666667 = 0.9166666667
-1.25x + x2 = 0.9166666667

The x term is -1.25x.  Take half its coefficient (-0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
-1.25x + 0.390625 + x2 = 0.9166666667 + 0.390625

Reorder the terms:
0.390625 + -1.25x + x2 = 0.9166666667 + 0.390625

Combine like terms: 0.9166666667 + 0.390625 = 1.3072916667
0.390625 + -1.25x + x2 = 1.3072916667

Factor a perfect square on the left side:
(x + -0.625)(x + -0.625) = 1.3072916667

Calculate the square root of the right side: 1.143368561

Break this problem into two subproblems by setting 
(x + -0.625) equal to 1.143368561 and -1.143368561.

Subproblem 1

x + -0.625 = 1.143368561 Simplifying x + -0.625 = 1.143368561 Reorder the terms: -0.625 + x = 1.143368561 Solving -0.625 + x = 1.143368561 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + x = 1.143368561 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + x = 1.143368561 + 0.625 x = 1.143368561 + 0.625 Combine like terms: 1.143368561 + 0.625 = 1.768368561 x = 1.768368561 Simplifying x = 1.768368561

Subproblem 2

x + -0.625 = -1.143368561 Simplifying x + -0.625 = -1.143368561 Reorder the terms: -0.625 + x = -1.143368561 Solving -0.625 + x = -1.143368561 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + x = -1.143368561 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + x = -1.143368561 + 0.625 x = -1.143368561 + 0.625 Combine like terms: -1.143368561 + 0.625 = -0.518368561 x = -0.518368561 Simplifying x = -0.518368561

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.768368561, -0.518368561}

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