3x^2-43x+120=0

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Solution for 3x^2-43x+120=0 equation:


Simplifying
3x2 + -43x + 120 = 0

Reorder the terms:
120 + -43x + 3x2 = 0

Solving
120 + -43x + 3x2 = 0

Solving for variable 'x'.

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

Divide each side by '3'.
40 + -14.33333333x + x2 = 0

Move the constant term to the right:

Add '-40' to each side of the equation.
40 + -14.33333333x + -40 + x2 = 0 + -40

Reorder the terms:
40 + -40 + -14.33333333x + x2 = 0 + -40

Combine like terms: 40 + -40 = 0
0 + -14.33333333x + x2 = 0 + -40
-14.33333333x + x2 = 0 + -40

Combine like terms: 0 + -40 = -40
-14.33333333x + x2 = -40

The x term is -14.33333333x.  Take half its coefficient (-7.166666665).
Square it (51.36111109) and add it to both sides.

Add '51.36111109' to each side of the equation.
-14.33333333x + 51.36111109 + x2 = -40 + 51.36111109

Reorder the terms:
51.36111109 + -14.33333333x + x2 = -40 + 51.36111109

Combine like terms: -40 + 51.36111109 = 11.36111109
51.36111109 + -14.33333333x + x2 = 11.36111109

Factor a perfect square on the left side:
(x + -7.166666665)(x + -7.166666665) = 11.36111109

Calculate the square root of the right side: 3.370624733

Break this problem into two subproblems by setting 
(x + -7.166666665) equal to 3.370624733 and -3.370624733.

Subproblem 1

x + -7.166666665 = 3.370624733 Simplifying x + -7.166666665 = 3.370624733 Reorder the terms: -7.166666665 + x = 3.370624733 Solving -7.166666665 + x = 3.370624733 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.166666665' to each side of the equation. -7.166666665 + 7.166666665 + x = 3.370624733 + 7.166666665 Combine like terms: -7.166666665 + 7.166666665 = 0.000000000 0.000000000 + x = 3.370624733 + 7.166666665 x = 3.370624733 + 7.166666665 Combine like terms: 3.370624733 + 7.166666665 = 10.537291398 x = 10.537291398 Simplifying x = 10.537291398

Subproblem 2

x + -7.166666665 = -3.370624733 Simplifying x + -7.166666665 = -3.370624733 Reorder the terms: -7.166666665 + x = -3.370624733 Solving -7.166666665 + x = -3.370624733 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.166666665' to each side of the equation. -7.166666665 + 7.166666665 + x = -3.370624733 + 7.166666665 Combine like terms: -7.166666665 + 7.166666665 = 0.000000000 0.000000000 + x = -3.370624733 + 7.166666665 x = -3.370624733 + 7.166666665 Combine like terms: -3.370624733 + 7.166666665 = 3.796041932 x = 3.796041932 Simplifying x = 3.796041932

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.537291398, 3.796041932}

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