3x^2-78x+200=0

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Solution for 3x^2-78x+200=0 equation:


Simplifying
3x2 + -78x + 200 = 0

Reorder the terms:
200 + -78x + 3x2 = 0

Solving
200 + -78x + 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'.
66.66666667 + -26x + x2 = 0

Move the constant term to the right:

Add '-66.66666667' to each side of the equation.
66.66666667 + -26x + -66.66666667 + x2 = 0 + -66.66666667

Reorder the terms:
66.66666667 + -66.66666667 + -26x + x2 = 0 + -66.66666667

Combine like terms: 66.66666667 + -66.66666667 = 0.00000000
0.00000000 + -26x + x2 = 0 + -66.66666667
-26x + x2 = 0 + -66.66666667

Combine like terms: 0 + -66.66666667 = -66.66666667
-26x + x2 = -66.66666667

The x term is -26x.  Take half its coefficient (-13).
Square it (169) and add it to both sides.

Add '169' to each side of the equation.
-26x + 169 + x2 = -66.66666667 + 169

Reorder the terms:
169 + -26x + x2 = -66.66666667 + 169

Combine like terms: -66.66666667 + 169 = 102.33333333
169 + -26x + x2 = 102.33333333

Factor a perfect square on the left side:
(x + -13)(x + -13) = 102.33333333

Calculate the square root of the right side: 10.115993937

Break this problem into two subproblems by setting 
(x + -13) equal to 10.115993937 and -10.115993937.

Subproblem 1

x + -13 = 10.115993937 Simplifying x + -13 = 10.115993937 Reorder the terms: -13 + x = 10.115993937 Solving -13 + x = 10.115993937 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + x = 10.115993937 + 13 Combine like terms: -13 + 13 = 0 0 + x = 10.115993937 + 13 x = 10.115993937 + 13 Combine like terms: 10.115993937 + 13 = 23.115993937 x = 23.115993937 Simplifying x = 23.115993937

Subproblem 2

x + -13 = -10.115993937 Simplifying x + -13 = -10.115993937 Reorder the terms: -13 + x = -10.115993937 Solving -13 + x = -10.115993937 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + x = -10.115993937 + 13 Combine like terms: -13 + 13 = 0 0 + x = -10.115993937 + 13 x = -10.115993937 + 13 Combine like terms: -10.115993937 + 13 = 2.884006063 x = 2.884006063 Simplifying x = 2.884006063

Solution

The solution to the problem is based on the solutions from the subproblems. x = {23.115993937, 2.884006063}

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