3x^2-26x+9=0

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Solution for 3x^2-26x+9=0 equation:


Simplifying
3x2 + -26x + 9 = 0

Reorder the terms:
9 + -26x + 3x2 = 0

Solving
9 + -26x + 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'.
3 + -8.666666667x + x2 = 0

Move the constant term to the right:

Add '-3' to each side of the equation.
3 + -8.666666667x + -3 + x2 = 0 + -3

Reorder the terms:
3 + -3 + -8.666666667x + x2 = 0 + -3

Combine like terms: 3 + -3 = 0
0 + -8.666666667x + x2 = 0 + -3
-8.666666667x + x2 = 0 + -3

Combine like terms: 0 + -3 = -3
-8.666666667x + x2 = -3

The x term is -8.666666667x.  Take half its coefficient (-4.333333334).
Square it (18.77777778) and add it to both sides.

Add '18.77777778' to each side of the equation.
-8.666666667x + 18.77777778 + x2 = -3 + 18.77777778

Reorder the terms:
18.77777778 + -8.666666667x + x2 = -3 + 18.77777778

Combine like terms: -3 + 18.77777778 = 15.77777778
18.77777778 + -8.666666667x + x2 = 15.77777778

Factor a perfect square on the left side:
(x + -4.333333334)(x + -4.333333334) = 15.77777778

Calculate the square root of the right side: 3.972125096

Break this problem into two subproblems by setting 
(x + -4.333333334) equal to 3.972125096 and -3.972125096.

Subproblem 1

x + -4.333333334 = 3.972125096 Simplifying x + -4.333333334 = 3.972125096 Reorder the terms: -4.333333334 + x = 3.972125096 Solving -4.333333334 + x = 3.972125096 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.333333334' to each side of the equation. -4.333333334 + 4.333333334 + x = 3.972125096 + 4.333333334 Combine like terms: -4.333333334 + 4.333333334 = 0.000000000 0.000000000 + x = 3.972125096 + 4.333333334 x = 3.972125096 + 4.333333334 Combine like terms: 3.972125096 + 4.333333334 = 8.30545843 x = 8.30545843 Simplifying x = 8.30545843

Subproblem 2

x + -4.333333334 = -3.972125096 Simplifying x + -4.333333334 = -3.972125096 Reorder the terms: -4.333333334 + x = -3.972125096 Solving -4.333333334 + x = -3.972125096 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.333333334' to each side of the equation. -4.333333334 + 4.333333334 + x = -3.972125096 + 4.333333334 Combine like terms: -4.333333334 + 4.333333334 = 0.000000000 0.000000000 + x = -3.972125096 + 4.333333334 x = -3.972125096 + 4.333333334 Combine like terms: -3.972125096 + 4.333333334 = 0.361208238 x = 0.361208238 Simplifying x = 0.361208238

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.30545843, 0.361208238}

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