12x^2-47x-40=0

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Solution for 12x^2-47x-40=0 equation:


Simplifying
12x2 + -47x + -40 = 0

Reorder the terms:
-40 + -47x + 12x2 = 0

Solving
-40 + -47x + 12x2 = 0

Solving for variable 'x'.

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

Divide each side by '12'.
-3.333333333 + -3.916666667x + x2 = 0

Move the constant term to the right:

Add '3.333333333' to each side of the equation.
-3.333333333 + -3.916666667x + 3.333333333 + x2 = 0 + 3.333333333

Reorder the terms:
-3.333333333 + 3.333333333 + -3.916666667x + x2 = 0 + 3.333333333

Combine like terms: -3.333333333 + 3.333333333 = 0.000000000
0.000000000 + -3.916666667x + x2 = 0 + 3.333333333
-3.916666667x + x2 = 0 + 3.333333333

Combine like terms: 0 + 3.333333333 = 3.333333333
-3.916666667x + x2 = 3.333333333

The x term is -3.916666667x.  Take half its coefficient (-1.958333334).
Square it (3.835069447) and add it to both sides.

Add '3.835069447' to each side of the equation.
-3.916666667x + 3.835069447 + x2 = 3.333333333 + 3.835069447

Reorder the terms:
3.835069447 + -3.916666667x + x2 = 3.333333333 + 3.835069447

Combine like terms: 3.333333333 + 3.835069447 = 7.16840278
3.835069447 + -3.916666667x + x2 = 7.16840278

Factor a perfect square on the left side:
(x + -1.958333334)(x + -1.958333334) = 7.16840278

Calculate the square root of the right side: 2.677387305

Break this problem into two subproblems by setting 
(x + -1.958333334) equal to 2.677387305 and -2.677387305.

Subproblem 1

x + -1.958333334 = 2.677387305 Simplifying x + -1.958333334 = 2.677387305 Reorder the terms: -1.958333334 + x = 2.677387305 Solving -1.958333334 + x = 2.677387305 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.958333334' to each side of the equation. -1.958333334 + 1.958333334 + x = 2.677387305 + 1.958333334 Combine like terms: -1.958333334 + 1.958333334 = 0.000000000 0.000000000 + x = 2.677387305 + 1.958333334 x = 2.677387305 + 1.958333334 Combine like terms: 2.677387305 + 1.958333334 = 4.635720639 x = 4.635720639 Simplifying x = 4.635720639

Subproblem 2

x + -1.958333334 = -2.677387305 Simplifying x + -1.958333334 = -2.677387305 Reorder the terms: -1.958333334 + x = -2.677387305 Solving -1.958333334 + x = -2.677387305 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.958333334' to each side of the equation. -1.958333334 + 1.958333334 + x = -2.677387305 + 1.958333334 Combine like terms: -1.958333334 + 1.958333334 = 0.000000000 0.000000000 + x = -2.677387305 + 1.958333334 x = -2.677387305 + 1.958333334 Combine like terms: -2.677387305 + 1.958333334 = -0.719053971 x = -0.719053971 Simplifying x = -0.719053971

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.635720639, -0.719053971}

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