3x^2-260x+1200=0

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Solution for 3x^2-260x+1200=0 equation:


Simplifying
3x2 + -260x + 1200 = 0

Reorder the terms:
1200 + -260x + 3x2 = 0

Solving
1200 + -260x + 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'.
400 + -86.66666667x + x2 = 0

Move the constant term to the right:

Add '-400' to each side of the equation.
400 + -86.66666667x + -400 + x2 = 0 + -400

Reorder the terms:
400 + -400 + -86.66666667x + x2 = 0 + -400

Combine like terms: 400 + -400 = 0
0 + -86.66666667x + x2 = 0 + -400
-86.66666667x + x2 = 0 + -400

Combine like terms: 0 + -400 = -400
-86.66666667x + x2 = -400

The x term is -86.66666667x.  Take half its coefficient (-43.33333334).
Square it (1877.777778) and add it to both sides.

Add '1877.777778' to each side of the equation.
-86.66666667x + 1877.777778 + x2 = -400 + 1877.777778

Reorder the terms:
1877.777778 + -86.66666667x + x2 = -400 + 1877.777778

Combine like terms: -400 + 1877.777778 = 1477.777778
1877.777778 + -86.66666667x + x2 = 1477.777778

Factor a perfect square on the left side:
(x + -43.33333334)(x + -43.33333334) = 1477.777778

Calculate the square root of the right side: 38.441875318

Break this problem into two subproblems by setting 
(x + -43.33333334) equal to 38.441875318 and -38.441875318.

Subproblem 1

x + -43.33333334 = 38.441875318 Simplifying x + -43.33333334 = 38.441875318 Reorder the terms: -43.33333334 + x = 38.441875318 Solving -43.33333334 + x = 38.441875318 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '43.33333334' to each side of the equation. -43.33333334 + 43.33333334 + x = 38.441875318 + 43.33333334 Combine like terms: -43.33333334 + 43.33333334 = 0.00000000 0.00000000 + x = 38.441875318 + 43.33333334 x = 38.441875318 + 43.33333334 Combine like terms: 38.441875318 + 43.33333334 = 81.775208658 x = 81.775208658 Simplifying x = 81.775208658

Subproblem 2

x + -43.33333334 = -38.441875318 Simplifying x + -43.33333334 = -38.441875318 Reorder the terms: -43.33333334 + x = -38.441875318 Solving -43.33333334 + x = -38.441875318 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '43.33333334' to each side of the equation. -43.33333334 + 43.33333334 + x = -38.441875318 + 43.33333334 Combine like terms: -43.33333334 + 43.33333334 = 0.00000000 0.00000000 + x = -38.441875318 + 43.33333334 x = -38.441875318 + 43.33333334 Combine like terms: -38.441875318 + 43.33333334 = 4.891458022 x = 4.891458022 Simplifying x = 4.891458022

Solution

The solution to the problem is based on the solutions from the subproblems. x = {81.775208658, 4.891458022}

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