3x^2-84x+26=0

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Solution for 3x^2-84x+26=0 equation:


Simplifying
3x2 + -84x + 26 = 0

Reorder the terms:
26 + -84x + 3x2 = 0

Solving
26 + -84x + 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'.
8.666666667 + -28x + x2 = 0

Move the constant term to the right:

Add '-8.666666667' to each side of the equation.
8.666666667 + -28x + -8.666666667 + x2 = 0 + -8.666666667

Reorder the terms:
8.666666667 + -8.666666667 + -28x + x2 = 0 + -8.666666667

Combine like terms: 8.666666667 + -8.666666667 = 0.000000000
0.000000000 + -28x + x2 = 0 + -8.666666667
-28x + x2 = 0 + -8.666666667

Combine like terms: 0 + -8.666666667 = -8.666666667
-28x + x2 = -8.666666667

The x term is -28x.  Take half its coefficient (-14).
Square it (196) and add it to both sides.

Add '196' to each side of the equation.
-28x + 196 + x2 = -8.666666667 + 196

Reorder the terms:
196 + -28x + x2 = -8.666666667 + 196

Combine like terms: -8.666666667 + 196 = 187.333333333
196 + -28x + x2 = 187.333333333

Factor a perfect square on the left side:
(x + -14)(x + -14) = 187.333333333

Calculate the square root of the right side: 13.686976778

Break this problem into two subproblems by setting 
(x + -14) equal to 13.686976778 and -13.686976778.

Subproblem 1

x + -14 = 13.686976778 Simplifying x + -14 = 13.686976778 Reorder the terms: -14 + x = 13.686976778 Solving -14 + x = 13.686976778 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + x = 13.686976778 + 14 Combine like terms: -14 + 14 = 0 0 + x = 13.686976778 + 14 x = 13.686976778 + 14 Combine like terms: 13.686976778 + 14 = 27.686976778 x = 27.686976778 Simplifying x = 27.686976778

Subproblem 2

x + -14 = -13.686976778 Simplifying x + -14 = -13.686976778 Reorder the terms: -14 + x = -13.686976778 Solving -14 + x = -13.686976778 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + x = -13.686976778 + 14 Combine like terms: -14 + 14 = 0 0 + x = -13.686976778 + 14 x = -13.686976778 + 14 Combine like terms: -13.686976778 + 14 = 0.313023222 x = 0.313023222 Simplifying x = 0.313023222

Solution

The solution to the problem is based on the solutions from the subproblems. x = {27.686976778, 0.313023222}

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