3x^2-26x-9=9

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


Simplifying
3x2 + -26x + -9 = 9

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

Solving
-9 + -26x + 3x2 = 9

Solving for variable 'x'.

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

Combine like terms: -9 + -9 = -18
-18 + -26x + 3x2 = 9 + -9

Combine like terms: 9 + -9 = 0
-18 + -26x + 3x2 = 0

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

Divide each side by '3'.
-6 + -8.666666667x + x2 = 0

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + -8.666666667x + 6 + x2 = 0 + 6

Reorder the terms:
-6 + 6 + -8.666666667x + x2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -8.666666667x + x2 = 0 + 6
-8.666666667x + x2 = 0 + 6

Combine like terms: 0 + 6 = 6
-8.666666667x + x2 = 6

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 = 6 + 18.77777778

Reorder the terms:
18.77777778 + -8.666666667x + x2 = 6 + 18.77777778

Combine like terms: 6 + 18.77777778 = 24.77777778
18.77777778 + -8.666666667x + x2 = 24.77777778

Factor a perfect square on the left side:
(x + -4.333333334)(x + -4.333333334) = 24.77777778

Calculate the square root of the right side: 4.977728175

Break this problem into two subproblems by setting 
(x + -4.333333334) equal to 4.977728175 and -4.977728175.

Subproblem 1

x + -4.333333334 = 4.977728175 Simplifying x + -4.333333334 = 4.977728175 Reorder the terms: -4.333333334 + x = 4.977728175 Solving -4.333333334 + x = 4.977728175 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 = 4.977728175 + 4.333333334 Combine like terms: -4.333333334 + 4.333333334 = 0.000000000 0.000000000 + x = 4.977728175 + 4.333333334 x = 4.977728175 + 4.333333334 Combine like terms: 4.977728175 + 4.333333334 = 9.311061509 x = 9.311061509 Simplifying x = 9.311061509

Subproblem 2

x + -4.333333334 = -4.977728175 Simplifying x + -4.333333334 = -4.977728175 Reorder the terms: -4.333333334 + x = -4.977728175 Solving -4.333333334 + x = -4.977728175 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 = -4.977728175 + 4.333333334 Combine like terms: -4.333333334 + 4.333333334 = 0.000000000 0.000000000 + x = -4.977728175 + 4.333333334 x = -4.977728175 + 4.333333334 Combine like terms: -4.977728175 + 4.333333334 = -0.644394841 x = -0.644394841 Simplifying x = -0.644394841

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.311061509, -0.644394841}

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